Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. What experiment did he conduct to test this hypothesis?
Answer:
Darwin conducted an experiment with breeding pigeons.
Explanation:
The pigeons provided the perfect animal to test his theory of selection for quite a number of reasons including its trait diversity from wing structures to color patterns to size to flight patterns. From these experiments he concluded that by natural selection of randomly occurring traits that make species better suited for survival and reproduction, evolve in the astounding diversity of organisms on Earth today.
(not my words)
Answer:
its b
Explanation:
a nucleotide consists of?
A.a phosphates sugar and a nitrogen base
B.a sugar and a nitrogen base
C.a phosphate, an amino acid and a nitrogen base
D.a sugar, a protein and uracil
Answer:
a
Explanation:
a nucleotide consists of a phosphates sugar and nitrogen base.
Tetrodotoxin is a potent toxin found in a variety of organisms including the pufferfish. The toxin binds to the extracellular side of the Na+ channel and prevents channel opening. This leads to paralysis of muscles, including the diaphragm. Death from respiratory failure can occur after ingestion of as little as 1 mg of the toxin. Why does this toxin cause paralysis? Question 7 options: The axon membranes become over-depolarized. The Na+ channels remain in the inactive, refractory state. The Na+ channel does not open wide enough to allow enough Na+ through the channel. The membrane depolarization is not amplified along the axon.
Answer:
The correct answer is - The membrane depolarization is not amplified along the axon.
Explanation:
Tetrodotoxin, a neurotoxin present in the liver and gonads of Marine organisms. it can inhibit the soidum channels which means it blocks the entering of the sodium in the cells or neurons if consumed it and it can lead to neurological and gastrointestinal disorders.
These toxins block the signals to move along the nerves to muscles In absence of sodium action potential cannot be sent along the axon by blocking the sodium channels. This results in weakening and paralysis.
1 a
Starting with the mouth, list the structures that air passes through in order for oxygen
to be absorbed by a red blood cell.
red
blood
cell
mouth
tracheal
Answer:
The nostrils, nasal cavity, pharynx, larynx, trachea, bronchi and bronchioles.
Explanation:
The air enters to the mouth and passes through nostrils, nasal cavity, pharynx, larynx, trachea, bronchi and bronchioles and finally reaches alveoli where the exchange of gases such as carbondioxide and oxygen. The hemoglobin takes carbondioxide gas from the cells that are present all over body to the lungs. Their this carbondioxide gas is removed from the hemoglobin and absorb oxygen. This carbondioxide gas is releases from the body on the same pathway but reverse in direction.
8. Which observation would be the best evidence to use to argue that there is an evolutionary relationship between two species?
They occupy the same niche.
They have similar fur color.
They have similar DNA base sequences.
They inhabit the same geographic regions.
Answer: C: They have similar DNA base sequences
Explanation:
In which ocean's zone would you expect to see the
ecosystem shown?
the open ocean
the intertidal zone
the benthic zone
the neritic zone
zone?
Answer:
La zona intermareal
Explanation:
Por que en la información del texto
Answer:
Intertidal zone
Explanation:
I took the assigment :)
22. What is the importance of cilia and flagella for
microorganisms?
A structural protein collagen sometimes has a mutation that can causes a condition in which bones are weak and break easily. Which of the following are components (monomers) of collagen?
a. Amino acids
b.Nucleotides
c.Fatty acids
d.Carbohydrates
It's 58 degrees outside and a meteorologist says a cold front is headed to you area. What should you wear to prepare? *
sandals
rain jacket
snow jacket
hat and gloves
What is the sequence of the mRNA that would be written during transcription of this piece of DNA?
Answer:
AUCUAG is the correct combination
Explanation:
replace every letter with its xorresponding base pair of mRNA where A=U, T=A , C=G
The diagram below represents the time a cell spends in the two main phases
of the cell cycle. In which phase does a cell spend less time?
A. Interphase
B. R phase
C. M phase
O
D. Prophase
The cell spends less time in the M phase, also known as the mitotic phase, where the actual division of the cell takes place.
What does happen during M phase?During this phase, the cell undergoes mitosis or meiosis, depending on the type of cell, resulting in the formation of two daughter cells. In contrast, the interphase is the longest phase of the cell cycle, where the cell grows and carries out its normal metabolic activities.
The R phase, also known as the S phase, is a sub-phase of interphase where DNA replication occurs. Prophase is the first phase of mitosis and is relatively short compared to the M phase as a whole.
During prophase, the chromosomes condense, the nuclear envelope breaks down, and the spindle fibers form. In metaphase, the chromosomes align at the metaphase plate.
During anaphase, the sister chromatids separate and move towards the opposite poles. Finally, during telophase, the spindle fibers disassemble, the nuclear envelope reforms, and cytokinesis occurs, resulting in the division of the cytoplasm and formation of two identical daughter cells.
In terms of the amount of time spent in each phase, interphase is the longest, accounting for about 90% of the cell cycle. M phase, on the other hand, is relatively short, accounting for only about 10% of the cell cycle. Therefore, a cell spends less time in M phase than in interphase.
Learn more about mitotic phase at:
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What is the name of the organelle labeled with the letter A?
A
B
o
ה ס ד ה I
N
M
к
Animal cell
Answer:
the label letter A is lysosome
Which of the following best represents the purpose of fertilizers?
Answer:
Fertilizer, natural or artificial substance containing the chemical elements that improve growth and productiveness of plants. Fertilizers enhance the natural fertility of the soil or replace the chemical elements taken from the soil by previous crops.
I Need help with this question because I don't understand what to put
Answer:
https://www.nationalgeographic.org/article/hydrologic-cycle/#:~:text=The%20water%20cycle%20consists%20of,evaporation%2C%20condensation%2C%20and%20precipitation.&text=Evaporation%20is%20the%20process%20of,evaporates%20and%20becomes%20water%20vapor.&text=Water%20vapor%20is%20also%20an%20important%20greenhouse%20gas.
Explanation:
Which of the following best describes the producers in a terrestrial food web?
A) They are at the top of the energy pyramid.
B) They obtain their energy from consumers.
C) They are unaffected by decomposers.
D) They convert energy from the sun to chemical energy.
Answer:
The correct answer is - D. They convert energy from the sun to chemical energy.
Explanation:
In any food web, producers are the organism that can make their own food and energy by converting light energy coming from the sun into chemical energy, this process called photosynthesis.
Normally producers are green plants. These are present at the bottom of the energy pyramid as these are the highest in the number. Consumers et energy from producers by feed on them.
overexploitation means
Answer:
the action or fact of making excessive use of a resource.
Which of the following does NOT include a function of the cell membrane? *
It allows the cell to interact with and sense the external environment.
It controls what enters and exits the cell.
It helps the cell maintain homeostasis.
It provides energy for the cell in the form of ATP.
It provides energy for the cell in the form of ATP.
Mitochondria does that.
Why do animals that are active at night tend to have trouble seeing in color?
Why didn’t Darwin understand that genetics has passed on.
Answer:
Darwin did not know that DNA would become an important part of his Theory of Evolution. In fact, the subcategory of evolution called microevolution is completely based on DNA and the mechanism of how genetic information is passed down from parents to offspring.
Explanation:
DARWIN'S DIFFICULTIES WITH BLENDING INHERITANCE AND HIS THEORY OF PANGENESIS. Darwin failed to understand the significance of these results because he had no model of particulate inheritance that could be applied to genetic data.
For every action or force
in nature, there is an equal
and opposite reaction.
Answer:
Newton's Third Law of Motion
Explanation:
Newton's third law of motion states that any object that has a force applied to will react in the opposite direction
Hope It Helps you!!
Why do many water animals not have a well developed blood system?
The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases. Instead, gases, nutrients, and wastes are exchanged by diffusion.
Answer:
Explanation:
The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases. ... Instead, gases, nutrients, and wastes are exchanged by diffusion.
PLZZZZZZZZ HELPPPP!
What is an example of an event that can compromise an ecosystem?
1.seasonal climate change
2.seasonal dry period
3.d eveloping land around cities
4.high temperatures
Answer: Seasonal climate change
Explanation:
Answer:
1. Seasonal climate change
Explanation:
oh, and can you please talk to Miracle, she needs a lot of help right now since her grandma passed away
Which of the following processes takes place in the ribosomes of a cell?
O A. Transcription only
O B. Translation only
O C. Transcription and translation
O D. Replication only
Answer:
B.Translatiin only
Answer:
Option B Translation only
Explanation:
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How do the treatment and control of an inherited disease?
somebody pls pls help
Answer:
A
Explanation:
What stage of photosynthesis uses
carbon dioxide to make glucose?
A. Light reactions
B. Calvin Cycle
C. ATP synthesis
D Cellular respiration
Answer:
light reaction because glucose is a factor of sugar.
In a food web, which type of organism receives energy from the other three types?
A)producer
B)carnivore
C)decomposer
D)herbivore
Answer:
C decomposer
Explanation:
decomposers get their energy from dead animals so there at the end of the tree, meaning they get there energy off the other tree groups.
Can evolution happen to you PERSONALLY (in your lifetime)?
A. Yes I evolved from a baby to a teenager
B. No it happens over a whole generation
Answer:
B
Explanation:
Answer:
The answer is B
What is osmosis?
can someone explain this please
Answer:
it is the process by which water molecules passes through the semi-permeable membrane from a region of low concentration to a region of high concentration
Deforestation occurs when large Amounts of trees are cut down and not replaced which of the following would result from deforestation
A. Decrease carbon in the atmosphere
B. Increased carbon in the atmosphere
Answer:
The correct answer is (B).
Explanation:
Deforestation occurs when large Amounts of trees are cut down and not replaced, which of the following would result from deforestation...
Increased carbon in the atmosphere
This statement is true because when trees become less abundant, the amount of oxygen being released into the atmosphere by trees via photosynthesis.
The circumstance that would result from deforestation is the increased carbon in the atmosphere. Thus, the correct option is B.
What is Deforestation?Deforestation may be defined as the process of cutting down or eliminating trees in large numbers from our surroundings. This activity generally happens due to industrialization, wood extraction, urbanization, etc.
When the number of trees remains less in the environment due to deforestation or any other activity, the level of carbon dioxide in the atmosphere typically rises.
This is because carbon dioxide is considered the reactant of photosynthesis that is utilized by the plants along with water in the presence of sunlight and converted into oxygen.
But when the number of plants decreases, the level of carbon in the atmosphere increases, and the level of oxygen in the atmosphere decreases.
Therefore, the circumstance that would result from deforestation is the increased carbon in the atmosphere. Thus, the correct option is B.
To learn more about Deforestation, refer to the link:
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