Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation in a population environmental changes.
Gene flow, or the transfer of genes between several groups of organisms, is another source. The development of new gene combinations through sexual reproduction can also result in genetic variety.
Genetic variation is the variance in DNA sequences among members of a population. Germ cells, such as sperm and eggs, as well as somatic (all other) cells, are subject to variation.
Gene variants, sometimes known as mutations, can cause genetic differences, or a normal process in which genetic information is rearranged as a cell prepares to divide can also cause genetic variations (known as genetic recombination). Different phenotypes can be introduced into an organism by genetic changes that change gene activity or protein function.
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What are F1 and F2 genotypes?
F1 generation is the first filial generation, whereas F2 generation is the second filial generation obtained by crossing the F1 generation.
F1 is the first filial generation obtained by crossing two different parents. The parents are different from one another; one is homozygous dominant for both qualities, while the other is homozygous recessive. For both features, all of the progeny exhibit dominant traits. It is crucial for hybridization because it produces offspring with the best traits from both parents. Outbreeding depression, or decreased fitness in the progeny as a result of a cross between two distant parents, is occasionally observed in the F1 generation.
The F1 generation was self-crossed to produce the second filial generation. Both features are heterozygous in the parents. The generation displays a 9:3:3:1 phenotypic ratio. It is crucial for preserving a pure line or for keeping the qualities stable across several generations. Inbreeding depression in the F2 generation, when the offspring have a lower survival and fertility rate, might result from ongoing inbreeding of the F1 generation.
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Match the descriptions to the correct type of fungi.
Fungi can be incredibly sophisticated multicellular organisms or single-celled critters.
What are Fungi?They can be found in almost any location, but the majority of them prefer to dwell on land, primarily in soil or on plant matter, as opposed to the sea or fresh water.
The decomposers are a group that thrives in the soil or on dead plant matter and is crucial to the cycling of carbon and other elements. Some are parasites of plants that spread illnesses like canker, rust, scabs, and mildew.
Fungal diseases in crops can cause the farmer to lose a lot of money. A very small percentage of fungi can make animals sick. These include skin conditions that affect humans including athletes foot, ringworm, and thrush.
Therefore, Fungi can be incredibly sophisticated multicellular organisms or single-celled critters.
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The complete question is :
1.has positive and negative mating strands, 2. has erect fruiting body and 3.the first fungi to evolve, 4.lives in a varied habitat and exhibits all forms of nutrition. A. chytrid---------------------- and B. common mold-----------, C. sac fungi-------------------, D. club fungi------------------
What gene controls fur color?
Scientists have identified a gene, DKK4, that helps regulate the early development of different coat patterns in domestic cats. The team believes that DKK4 is likely involved in color patterns in all cats, and possibly other mammals as well.
A cat with a dominant color (black, red, calico, etc.) needs a parent to indicate the dominant color. Her two parents with recessive colors (cream, blue, etc.) cannot produce offspring with dominant colors (black, red, etc.).
A co-dominant red gene (O/o) found on the X chromosome determines whether there is a red variation in coat color. This gene encodes pheomelanin. The dominant O allele encodes an orange tone, while the recessive O allele encodes non-orange pigmentation (black or brown).
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The female reproductive system produces a reproductive cell called a(n) . These cells are produced in the ovaries. Then they travel to a(n) and finally to the uterus.
The female reproductive system produces a reproductive cell called egg . These cells are produced in the ovaries. Then they travel to fallopian tube and finally to the uterus.
What is the female reproductive system?
The outer part of the female genitalia is called the vulva, which means covering. The vulva is located between the legs and covers the opening to the vagina and other reproductive organs of the body.
Female reproductive organs are the vagina, uterus, fallopian tubes, and ovaries. A female reproductive system enables a woman to:
produce egg cells (eggs)have intercourseprotect and nourish fertilized eggs until they are fully developedgive birth HerOvaries have her two main reproductive functions in the body. They produce oocytes (eggs) for fertilization and produce the reproductive hormones estrogen, progesterone, and androgens.
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Approximately how many plant made pharmaceuticals are currently under different stages of discovery?
a.
100
b.
200
c.
300
d.
400
Why are there often so many steps between the original signal event and the cell's response?
This is because a variety of components must be integrated in order to accurately interpret and respond to the signal in a timely and effective manner.
The first step in this process is for the signal to be received and interpreted by the cell. This involves the binding of the signal molecule to a specific receptor, which triggers a cascade of cellular responses. This involves the activation of certain proteins, which then act as mediators of the signal within the cell and help to direct the response.
Once the signal has been received and interpreted, it must then be transmitted to the target organelle or region of the cell. This is done by a variety of molecules such as hormones, neurotransmitters, and growth factors. These molecules are released from the cell and travel to their target where they bind to specific receptors. This triggers a series of responses in the target organelle or region.
Finally, the cell must respond appropriately to the signal. This involves the activation of specific genes, which then produce proteins that alter the cells physiology and behavior. This is a process of gene expression that is tightly regulated and allows the cell to respond rapidly and accurately to the signal.
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Please answer all and make sure they are correct!!!!!!!! 50 POINTS
I know its a lot sorry..... :(
---------------------------------------------------------------------------------------------------------------------Name all the Five Extinctions.
When did they happen?
What are the causes?
What are the top three groups that became extinct?
What is a coal gap?
What is a coral gap?
Which is the biggest extinction?
How many years did it take for the ecosystems to recover after the Permian Triassic Mass Extinction?
Which mass extinction is the briefest among all five mass extinctions?
How big was the hole created by the asteroid when it hit the earth?
Which mass extinction had the biggest deep ocean extinction?
----------------------------------------------------------------------------------------------------------------------------
!!!!! 50 POINTS !!!!!! !!!!! 50 POINTS !!!!!! !!!!! 50 POINTS !!!!!!
Please make sure your answer is correct!! Thank you.
Ordovician end (444 million years ago; mya), Devonian, late (360 mya), Final Permian (250 mya), People frequently confuse the end of the Triassic period (200 mya) for the extinction of the dinosaurs.
What is mass extinction?
End of the Cretaceous (65 million years ago), the dinosaur extinction catastrophe. The primary reason for contemporary extinctions is habitat destruction.
Permian and the beginning of the Triassic periods, some 250 million years ago, Earth went through its worst environmental catastrophe ever.
The crater's diameter and depth are estimated to be 180 kilometers (110 miles) and 12 miles.
Therefore, around 252 million years ago, the end of the Permian epoch was marked by the greatest extinction in Earth's history.
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In ( Blank ) interference, the energy of the combined wave is greater than the energy of each of the two waves.
In constructive interference, the energy of the combined wave is greater than the energy of each of the two waves.
A wave of greater, lower, or the same amplitude is created when two waves merge through interference by combining their displacements at all points in space and time. The interaction of waves that are coherent or correlated with one another, either because they originate from the same source or because their frequencies are similar or almost identical, leads to both constructive and destructive interference.
According to the principle of superposition of waves, the consequent amplitude at a place where two or more waves of the same kind are incident is equal to the vector sum of the amplitudes of the individual waves. Constructive interference occurs when the crests of two waves with the same frequency cross at the same location. In this case, the amplitude of each wave is equal to the sum of its individual amplitudes. Destructive interference occurs when the peak of one wave collides with the trough of another wave, resulting in an amplitude equal to the difference between the separate amplitudes.
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What is the summary of Mendel's principles?
Gregor Mendel discovered the basic laws of heredity through the study of peas. He concluded that genes come in pairs and are inherited as separate entities, one from each parent. Mendel traced the segregation of parental genes and their appearance in offspring as dominant or recessive traits.
Mendel's four postulates and laws of heredity are: (1) the principle of pair factor, (2) the principle of dominance, (3) the law of germline segregation or purity (Mendel's first law of inheritance) and (4) the law of independent selection (Mendel's second law of inheritance).
Mendel generalized the results of his pea experiment into his three principles that explain the genetic basis of diploid organisms. they are: the principle of segregation, the principle of dominance, and the principle of independent assortment.
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How does an increase in cell size affect ratio of surface area?
As the cell radius increases, the surface area increases as the radius squared, but the volume increases as the radius cubed (much faster). Therefore, as the cell size increases, the surface area to volume ratio decreases.
Cell proliferation reduces the surface area to volume ratio. This is because as a cell grows, its volume (its internal contents) increases faster than its surface area (its cell membrane).
As cells grow larger, the surface area to volume ratio decreases dramatically, similar to an agar cube. Larger cells have to transport substances across membranes, but they deliver a larger volume and a proportionately smaller surface area.
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what is the volume of the graduated cylinder?
Explanation:
The formula for the volume of a cylinder is V=Bh or V=πr2h . The radius of the cylinder is 8 cm and the height is 15 cm. Substitute 8 for r and 15 for h in the formula V=πr2h .
Cobalamin, more commonly called vitamin B12, ______________________________. Question 50 options: is found abundantly in plant foods. when taken as a supplement, will increase metabolic functions, such as endurance performance. was one of the first parts of the B complex group to be discovered. is essential int he synthesis of DNA and in the development of red blood cells.
Cobalamin, or vitamin B12, is a water-soluble vitamin that is essential for human health. It is found abundantly in animal-derived foods, such as fish, meat, poultry, eggs, and dairy products, but it is not found in plant-based foods.
It is one of the first vitamins to be discovered and is part of the B-complex group of vitamins. Vitamin B12 plays a vital role in the synthesis of DNA, red blood cell development, and metabolic functions, such as endurance performance. When taken as a supplement, it can help to increase metabolic functions, such as endurance performance. It is also important for maintaining healthy nerve cells, as well as a healthy immune system.
Vitamin B12 deficiency can lead to anemia, fatigue, and cognitive decline. Therefore, it is important to ensure adequate intake of this essential vitamin, either through dietary sources or supplements. It is important to note that vitamin B12 is only found in animal-derived foods, so vegans and vegetarians should consider taking a vitamin B12 supplement to avoid deficiency.
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What are some examples of mollusks and what makes them different from each other?
Mollusks are classified into various classes like Gastropod, Bivalvia, Cephalopoda, and Polyplacophora .
Gastropods have a special characteristics that includes spirally-coiled external shell while others mollusks usually have a flattened shell, and many of them doesn't possess any shell as outer structure.
Four common characteristics that all mollusks share , are having soft bodies, a mantle, a visceral mass, and the foot. The phylum Mollusca has many distinctive features and special characteristics, which include a mantle cavity, visceral mass, foot, and radula. Mantle is the cavity which is used for breathing and excretion purpose , radula is longue like structure that helps in sensory and food grasping purpose.
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What features of mature forest species, such as oak trees, make them able to dominate and compete in the ecosystem
They require a long time to become exceptionally tall interminably. They give an overhang to conceal the others and give natural surroundings to many living with widely varied vegetation.
Notwithstanding trees, each progressive local area harbors numerous other living things, with the best variety populating the peak local area. Comparative biological zonings happen among marine widely varied vegetation, reliant upon such environmental variables as a base organization, accessibility of light, and level of saltiness.
Particular logging is a more environmentally maintainable practice than clear-cutting, which involves eliminating all trees simultaneously. The thought behind particular logging is to keep lopsided or all-matured timberland of trees fluctuating in age as well as in size and species also.
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A landowner plans to harvest a large area of pine trees to sell for lumber. How can
the landowner best sustain the pine trees as a natural resource?
A The landowner should consult a forester and replant the land with pine trees.
B The landowner should leave a few trees and let the land regenerate
naturally.
C The landowner should replant the land with corn or soybeans.
D The landowner should plant a few genetically altered trees.
Few trees should be left standing, and the landowner should let nature take its course.
Can a forest naturally regrow?A forest can quickly undergo organic regeneration through the growth of grass and herbs. By allowing deforested areas to remain unattended for a long time, the regrowth of forests can happen spontaneously and without the help of humans.
Regeneration of natural resources?Old stands must be left alone or have had afforestation rehabilitation and been given time to mature to the point of generating seeds in order for natural regeneration to occur. The majority of Central and Eastern European nations as well as Scandinavian nations are like this.
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simple sugars, like glucose, can be combined to make more complex larger sugar molecules like fructose and complex carbohydrates
true or false
Answer: true
Explanation:
Which experiment would most likely contain experimental bias?
A.
A student tests the attraction of bees to flowers by placing four different flowers in the same location and counting how many bees visit each.
B.
A chemistry class performs an experiment in which each reaction has the same amount of starting material and begins at the same temperature.
C.
A lab performs a test by giving bacterial colonies the same amount of different antibiotics and growing them under the same conditions.
D.
A company that makes pain relief medication tests the effectiveness of their own medicine compared to that of three other brands.
The experiment which would most likely contain experimental bias is a company that makes pain relief medication tests the effectiveness of their own medicine compared to that of three other brands which is therefore denoted as option D.
What is an Experiment?This is referred to as a procedure which is usually carried out in the laboratory and it is used to support or refute a hypothesis.
Experimental bias on the other hand is the tendency of a scientist or researcher to introduce bias into an experiment through unconsciously affecting the results, data etc. This is because they would want to get values which would show that their drugs are more effective and suitable for use so as to promote more sales and is the reason why some form of bias may be introduced into the findings which was why it was chosen as the correct choice.
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Recently, researchers from Stanford University have changed mouse skin cells into mouse nerve cells. This was accomplished by inserting genes that control the synthesis of certain proteins into the skin cells. This type of research is often successful in advancing knowledge regarding the functioning of human cells because:
In this examination, the compound courier would be the yeast-glucose arrangement. The yeast-glucose arrangement would have the option to change the pH of the fluid in the cup since it contains a substance that can do as such.
in the event that an end is legitimate, comparable examinations by different researchers ought to bring about a similar end. which proclamation best depicts a theory?
Homeostasis is a unique balance that is kept up within body tissues and organs. It is dynamic since it is continually acclimating to the progressions that the frameworks experience.
As the yeast benefits from sugar, it produces carbon dioxide. With no spot to go except for up, this gas gradually fills the inflatable. A very much-like cycle occurs as the bread rises. Carbon dioxide from yeast fills great many inflatable-like air pockets in the mixture.
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5 Compare The images below show two processes by which clouds form when an air mass is lifted. In what ways are these two processes similar? In what ways are these two processes different?
The two processes Frontal Lifting and Orographic lifting are similar but different processes that occur int he Earth's Hydrologic Cycle.
When air is raised over an obstruction such as a mountain, this is known as orographic lifting. As the air mass is elevated, it cools and moisture inside the air mass condenses, perhaps becoming precipitation. Frontal lifting happens when warm and cold air masses collide.
What is Hydrologic Cycle?The water cycle is a biogeochemical cycle that depicts the continuous movement of water on, above, and below the Earth's surface. It is also known as the hydrologic cycle or the hydrological cycle.
The hydrologic cycle is critical because it is the means by which water reaches plants, animals, and us! Aside from providing water for people, animals, and plants, it also transports nutrients, diseases, and sediment into and out of aquatic habitats.
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If R is dominant to r, the offspring of the cross of RR with rr will: a. have the same phenotype as the RR parent. b. have the same phenotype as the rr parent. c. have the same genotype as the RR parent. d. be homozygous.
As a result, the progeny will still have the homozygous gene rr. As a result, the offspring will share both parents' genetics and phenotypic.
What does genotype imply in its entirety?The term "genotype" broadly refers to an organism's genetic make-up; in other words, this characterizes an organism's whole gene pool. The phrase can also be used to refer to a gene's alleles, or variant forms, in a more specific meaning.
Is the genotype AA typical?Typically, there are five (5) distinct blood genotype kinds. AA, AS, Ad, SS, & SC are their names. While the first pairs (AA and or AS) are typical, AC is uncommon, and the last two (SS, SC) are atypical and irregular, frequently resulting in sickle cell disease.
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Which viral life cycle would result in a quicker death for an infected cell? a. Retroviral cycle b. Prophage cycle c. Lysogenic cycle d. Lytic cycle
While the lysogenic cycle results in the integration of the phage into to the host genome, the lytic cycle produces the death of such host.
How does the lytic cycle work?In a lytic cycle, the virus transfers its genome it in to a host cell and starts replication by seizing control of the host's cellular machinery. When the infection is finished, the host cell is lysed, releasing the freshly duplicated and assembled viral proteins into the coastal waters.
Why is the lytic cycle named that?The lysis phase, which takes place after a virus has invaded a cell, produced new viral particles, and ruptured the cell membrane, is what gives the lytic cycle its name. In order to infect other cells, this causes the new vesicles, or viral complexes, to be released.
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Which of the following best describes the relationship between earthquakes and tsunamis?
A
An underwater earthquake can cause a tsunami.
B
Both are the result of big volcanic explosions.
C
Tsunami waves are the main cause of earthquakes.
D
Earthquakes prevent tsunamis from occurring
Option A. An underwater earthquake can cause a tsunami best describes the relationship between earthquakes and tsunamis.
What is an underwater earthquake or tsunami?An underwater earthquake or tsunami is a phenomenon in which an earthquake under the aquatic enviroment (i.e. the ocean) may cause the movement of higher waves that are transported to the coastline and thus they may cause neutral disasters, it is for that reason that tsunami is very dangerous and we need to be prepared under this type of situation when alerting the presence of an earthquake in the coastline zones.
Therefore, with this data, we can see that an underwater earthquake or tsunami is a natural phenomenon that may lead to climatic disasters and may be very harmful to human populations located on the coastline of a certain region of the earth, thereby we need to be prepared for these situations.
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Chloroplasts are a specialized structure that
convert sunlight into energy. Which cell type
requires these?
Plant or Animal
Answer:
Plant cells
Explanation:
The purpose of the chloroplast is to make sugars that feed the cell's machinery.
Answer:
Plant Cells require Chloroplasts.
Explanation:
A chloroplast is an organelle ( an organ within a cell) of a plant cell, who's main purpose is to convert energy from the Sun into chemical potential energy, otherwise known as photosynthesis.
PBS Evolution: Great Transformations
1. If the world’s history were compressed into one hour, how long have humans been here?
Microbes. Single-celled organisms
2. How long ago did mammals first appear on earth?
Mammals first appeared about 200 million years ago
3. What type of animal did the skull that Dr. Gingrich discovered resemble?
Dr. Gingrich discovered resembled a whale
4. What did "Whale Valley" used to be?
5. What unusual feature did they find at the end of the early tetrapods’ limbs?
6. How long ago did animals first appear on Earth?
About 800 million years.
7. When the mouse "eyeless" gene was implanted into the fruit flies, what happened?
8. How would walking on two legs be an advantage?
Humans have undergone evolutionary transitions, as mammals like whale resembled other mammals in terms of skulls and other sculptures on the basis of the fossils found.
The program begins with one of the most popular examples of a purported change used by the evolution contingency: the transition from land animals to the whale. This shift is demonstrated to be explained by the fossils of Pakicetus, Ambulocetus, Rhodocetus, Dorontid, and Basilosaurus. In contrast to a complete transitional fossil, Pakicetus only has a small piece of its cranium to show for itself. Although Ambulocetus is depicted in the documentary as a fully preserved fossil of an aquatic mammal with legs, this is an embellishment and stretching of the truth given that the skeleton of the animal was actually found to be very fractured. In the series, Rhodocetus is only depicted by a skull.
Many people have asserted that those "legs" weren't just vestigial; they also participated in copulation. They might have even had a swimming feature. In conclusion, two skulls, one incomplete, maybe transitional skeleton, and a complete aquatic whale type with short hind legs. Our top example of an apparent evolutionary transition comes from these data.
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The B vitamins play major roles in ____. Question 45 options: maintaining skin health and decreasing oxidative damage to skin cells decreasing free radicals and increasing epinephrine from the brain facilitating energy production and making red blood cells increasing fatty acid mobilization from adipose tissue and serving as neurotransmitters
The B vitamins play major roles in increasing fatty acid mobilization from adipose tissue and serving as neurotransmitters.
The B nutrients assist enzymes in our our bodies do their jobs and are vital for a huge variety of mobile functions, like breaking down carbohydrates and transporting vitamins at some point of the body. The B nutrients play an inter-associated function in maintaining our brains jogging properly. Perhaps the maximum famous of all of the B nutrients, B12 is essential for neurological feature, DNA production, and crimson blood cellular improvement. Vitamin B12 is wanted to shape crimson blood cells and DNA. It is likewise a key participant withinside the feature and improvement of mind and nerve cells. Vitamin B12 binds to the protein withinside the ingredients we eat.
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The term that refers to the presence of a tuft of flagella emerging from a single site is ______.
A. amphitrichous
B. lophotrichous
C. peritrichous
D. atrichous
E. monotrichous
Vlophotrichous Cell Biology describes tufts of flagella that are located near the cell pole.
How do flagella work? What are they made of?Flagella are tiny organelles that resemble hairs and aid in cell movement. In Latin, "flagellum" means "whip." A cell is helped to move through the fluid by the flagella, that resemble whips. Only a few number of organisms have special flagella that serve as sensing organs for temperature and pH changes.
What is a flagella cell?The flagellum's main purpose is to promote chemotaxis and movement. Bacteria can have one or more flagellums, and they can also be peritrichous or bipolar (containing several flagella at a single site) (having multiple flagella throughout the entire bacterium).
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Paleontologists are still debating about whether modern behavior, language, and art appeared more recently in Europe, about 50,000 years ago or further back, based on findings such as the tools and artifacts found at the Blombos cave. What do you think
Paleontologists have been debating the origins of modern behavior, language, and art for decades. This debate has recently been reignited by the discovery of tools and artifacts at the Blombos Cave in South Africa.
The artifacts found at Blombos suggest that modern behavior, language, and art appeared in Europe approximately 50,000 years ago. However, some paleontologists argue that these behaviors are likely to have appeared much earlier.
I believe that modern behavior, language, and art were likely present in Europe long before 50,000 years ago. Looking at the archaeological record, it is clear that behavior, language, and art have been evolving since the time of our early ancestor Homo erectus. Furthermore, the tools and artifacts found at Blombos are similar to those found in other parts of the world, suggesting that these behaviors were not isolated to Europe.
In addition to the archaeological evidence, there is also genetic evidence that suggests modern behavior, language, and art existed in Europe before 50,000 years ago. Genetic studies of modern humans suggest that all modern populations share a common ancestor who lived approximately 150,000 years ago. This suggests that modern behaviors, language, and art were likely present in Europe at least 100,000 years ago.
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What are the 3 factors of natural selection?
The core of Darwin's thesis is that if three criteria are met, natural selection will take place. Factors: The battle for existence, variety, and inheritance is represented by the circumstances highlighted in bold above.
Most attributes are inherited, more offspring are generated than can survive, and offspring with more attractive traits will survive and have more offspring than those with less favorable traits. These three principles result in natural selection, which is an unavoidable process.
More environment-adapted organisms are more likely to survive and pass on the genes that contributed to their success. Over time, species change and diverge as a result of this process. One method of accounting is natural selection.
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What are 3 characteristics of Earth that make it inhabitable?
It is at the proper distance from the Sun, and has a magnetic field that shields it from solar radiation.
What is Earth?Earth has an insulating atmosphere that keeps it warm and contains the correct chemistry for life, including carbon and water.
The lithosphere, asthenosphere, mesosphere, outer core, and inner core are possible divisions of the Earth's layers based on rheology. Living things can live thanks to the structure of Earth.
Therefore, while the sun produces heat and keeps the earth from freezing, the moon affects the tides and provides a supply of water.
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The rough endoplasmic reticulum is a cell structure that cnssits of folded membraes that contain ribosomes. What is the advantage of the folded membranes
The correct option is B The inner membrane is folded to generate cristae to improve the mitochondrion's capacity to manufacture ATP.
These folds allow substantially more electron transport chain enzymes and ATP synthase to be packed inside the mitochondrion.
he membrane. The more the folds the more the surface area to which more ribosomes can attach. The ribosomes are organelles responsible for the manufacture of protein in cells. Thereafter, the proteins are properly folded by the mediation of chaperones in the lumen of the RER.
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Full Question ;
The rough endoplasmic reticulum is a cell structure that consists of folded membranes that contain ribosomes. What is the advantage of the folded membranes?
A) decreases surface area in order to produce more Proteins
B) increases surface area in order to produce more proteins
C) increases volume of endoplasmic reticulum in order to produce more energy
D) decreases volume of the endoplasmic reticulum in order to make more energy