Parasites are organisms that live in or on a host organism, obtaining essential nutrition for themselves from the host. Parasites rarely kill their hosts, however. Which explanation BEST describes why evolutionary pressures selected for parasites that do not kill the host?

Answer:

it think it is the marker gene it said that online for me I dont know

if that even is a gene

Answer:

yes

Explanation:

Answer:

1. The anther produces the pollen grains that contain the sperm needed for fertilization

2.Petals attract the pollinators.

3.Stamens are the male reproductive organ

4.The main function of the stamen is to produce the pollen grains, which house male gametes , necessary for reproduction.

5.The stamen is made up of two parts: the anther and filament. The anther produces pollen (male reproductive cells). The filament holds the anther up.

6.A stamen consists of an anther (which produces pollen, the male reproductive cell) and a filament.

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Answer:

1. the anther

2. showy petals and sepals, nectar guides, shape, size, and color.

3. stamen

4. The pollen-producing part of a flower, usually with a slender filament supporting the anther.

5. the anther and filament

6. anther, filament, pollen

Explanation:

Answer:

Planets that are farther tend to have gas surfaces, a bigger diameter, and more moons. Planets closer to the sun have the opposite.

Answer:

1) The word ‘evolution’ was first mentioned in the book ‘The Origin of Species’ in 1859, by Charles Darwin. Darwin put forward the concept of evolution during his journey to the Galapagos Islands. 

2)Natural selection is an important mechanism of evolution. It states that the organisms that are able to survive and reproduce with the changing environmental conditions are selected by nature while the ones that cannot survive are eliminated.

3) Evolution mainly deals with the origin of life on earth. The conditions and the forms of life on earth were entirely different from what we see today.

please forgive me I cant answer 4th one..

5)Charles Darwin, an English naturalist of the 19th century made an extensive study of nature for over 20 years. 

1. The fossil record provides crucial evidence for biological evolution. Fossils are the preserved remains or traces of past organisms, providing a record of life on Earth over millions of years.

By studying fossils, scientists can observe changes in organisms and their characteristics over time. Fossils show a progression of simpler life forms in older layers to more complex ones in more recent layers.

2. Natural selection is a mechanism for biological change because it leads to the adaptation of populations to their environments over time. It is based on the concept that individuals within a population exhibit variation in traits, and those traits that enhance survival and reproduction are more likely to be passed on to future generations.

Through natural selection, individuals with advantageous traits have higher chances of surviving and reproducing, leading to the increased frequency of those traits in subsequent generations.

3. Chemical evolution, also known as abiogenesis or prebiotic evolution, explains the origin of life on Earth by proposing that life arose from non-living matter through a series of chemical reactions.

According to this theory, in Earth's early conditions, simple organic molecules formed from inorganic compounds through processes like lightning, volcanic activity, and reactions in the atmosphere and oceans.

These molecules then underwent further reactions, leading to the formation of more complex molecules like amino acids and nucleotides, which are the building blocks of proteins and nucleic acids, respectively.

4. Scientific theories such as biological and chemical evolution represent the strongest explanations for the changes observed in the fossil record because they are supported by extensive evidence from multiple scientific disciplines.

These theories have withstood rigorous testing, scrutiny, and peer review over many years. They are based on a large body of evidence, including the fossil record, comparative anatomy, genetics, molecular biology, and observations of natural populations.

5. Scientific theories on evolution and the fossil record can change over time as new evidence is discovered, technologies advance, and scientific understanding improves.

The process of scientific inquiry involves continuous investigation, testing, and refinement of theories based on new data and observations.

As scientists gather more evidence from fossil discoveries, genetic studies, experimental research, and other fields, our understanding of evolution and the fossil record can deepen and evolve.

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Answer:

hi-hi,

i believe the answer is that you'll create friction and thermal heat

Explanation:

https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/v/work-energy-problem-with-friction

this is the video i watched to help answer your question

good luck :)

i hope this helps

**please let me know if this was not what you were looking for/incorrect or both**

have a nice day!

Answer:

Following are the roles of the digestive, excretory and endocrine systems in terms of homeostasis:

Explanation:

Role of Endocrine System:

The endocrine system mediates all the chemical signaling in the body.

Hormones are chemical messengers that the endocrine system uses to maintain chemical homeostasis.

Endocrine system manages glucoregulation by controlling the secretion of the hormones glucagon and insulin by the pancreas. Low and high blood sugar levels are sensed by the brain which then signals the endocrine system to release glucagon and insulin respectively.

The endocrine system is also indirectly involved in thermoregulation. A low core temperature signal received by the hypothalamus initiates the release of TSH by the pituitary gland and then that of T3, T4 thyroid hormones that stimulate shivering thermogenesis in the skeletal muscles.

Role of Digestive System:

The digestive system regulates the amount of nutrients absorbed in the body.

Although the absorption of nutrients in food is not exactly according to bodily needs, the absorption of dietary iron and calcium is strictly regulated by the digestive system.

Role of Excretory System:

The excretory system carries out osmoregulation which is the maintenance and regulation of water and salt levels in the blood.

The excretory system regulates the excretion of toxic waste from the blood.

Excess water, salts, urea and bilirubin (produced as a result of RBC break down) are some of the excretions.

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Answer:

Following are the roles of the digestive, excretory and endocrine systems in terms of homeostasis:

The endocrine system regulates the secretion of various hormones and homeostatic mechanisms in response to signals of the hypothalamus and pituitary glands.

The excretory system maintains homeostasis by purifying the blood and getting rid of toxic waste from the blood.

The digestive system is mainly involved in the transfer and regulation of nutrients from food.

Explanation:

Role of Endocrine System:

The endocrine system mediates all the chemical signaling in the body.

Hormones are chemical messengers that the endocrine system uses to maintain chemical homeostasis.

Endocrine system manages glucoregulation by controlling the secretion of the hormones glucagon and insulin by the pancreas. Low and high blood sugar levels are sensed by the brain which then signals the endocrine system to release glucagon and insulin respectively.

The endocrine system is also indirectly involved in thermoregulation. A low core temperature signal received by the hypothalamus initiates the release of TSH by the pituitary gland and then that of T3, T4 thyroid hormones that stimulate shivering thermogenesis in the skeletal muscles.

Role of Digestive System:

The digestive system regulates the amount of nutrients absorbed in the body.

Although the absorption of nutrients in food is not exactly according to bodily needs, the absorption of dietary iron and calcium is strictly regulated by the digestive system.

Role of Excretory System:

The excretory system carries out osmoregulation which is the maintenance and regulation of water and salt levels in the blood.

The excretory system regulates the excretion of toxic waste from the blood.

Excess water, salts, urea and bilirubin (produced as a result of RBC break down) are some of the excretions.

Answer:

the annswer is b

Explanation:

just look at the questin and then see wicth one you can cross off

The three fundamental laws of classical mechanics known as Newton's laws of motion describe how an object's motion and the forces acting on it interact. The materials is more suitable as a liner for a safety helmet exists B.

The three fundamental laws of classical mechanics known as Newton's laws of motion describe how an object's motion and the forces acting on it interact. The following is a paraphrasing of these laws: Unless a force acts upon a body, it remains at rest or in continual straight-line motion. First Law of Motion of Newton Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace.

According to the first law, unless a force acts on an object, it will not alter its motion. According to the second law, an object's force is determined by multiplying its mass by its acceleration. According to the third law, when two objects interact, they exert equal-sized and opposite-direction forces upon one another.

The materials is more suitable as a liner for a safety helmet exists B.

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So In biology, a mutation is an alteration in the nucleotide sequence of the genome of an organism. So what would you look up that interests you

Hope This helps!!!

Answer: The genotype of an organism is defined as the sum of all its genes. The phenotype of an organism is the observable physical or biochemical characteristics of an organism, determined by both genetic make-up and environmental influences.

Explanation:

Answer: Primary sources are original works like research, diaries, paintings, and plays. Secondary sources are reviews of original work.

Answer:

Technology because we don't have the necessary technology to explore the parts of space and for all we know we don't even know what the universe actual looks like or if there are alternate universes but as technology advances we will know. Explanation:

Answer:

B

Explanation:

Sickle cell anemia is an autosomal recessive trait, meaning two recessive alleles must be acquired by the child (one from each parent) for them to be affected with the disorder.

Answer:

Earth's Surface rise and climate. You are basically looking at the weather and the condition of the atmosphere.

Explanation:

When the average temperature at the Earth's surface rise, evaporation occurs more which causes precipitation to also occur more.

Answer:blue

Explanations :

Answer:

Monomial

Explanation:

Answer:

Hopefully this is something that might help!

   Answer:                                                                                                                            

Explanation:

Answer: Was a category 5 hurricane

Regraded as the worst natural disaster to be recorded in history

Deadliest Atlantic hurricane since Mitch in 1998.

Explanation:

Answer:

Hurricane Maria was a deadly Category 5 hurricane that devastated Dominica, Saint Croix, and Puerto Rico in September 2017. Hurricane Maria was the third-costliest storm in U.S. history. It damaged or destroyed more than 300,000 homes, left 3 million people without power and caused about $100 billion in damage

Explanation:

Answer:

A

Explanation:

Answer:

A

Explanation:

Answer:

D

Explanation:

Because these are in oceans and on land.

Answer:

Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear.

Answer:

1

Explanation:

Omnivores are animals that eat both plants and animals. If you look at the bottom of the food web, you need to look for arrows that point towards an animal that also consumes other animals. The arrows indicate that the energy is being transferred from the plants to the omnivore. The Raccoon is the other organism that eats both a producer (blackberries) and other predators such as garter snakes and meadow voles.

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Answer:

1

Explanation:

Answer: J

Explanation:

Answer:

Explanation:

IV= breeds of rose bushes (this is independant because you are in control)

DV= number of roses (this is what you are montiroing so it's dependant)

Constants= environment in the greenhouse

Control= roses of the same breeds outside of the greenhouse

Answer:

The most ancient texts of Hinduism such as the Vedas and early Upanishads don't mention the soteriological term Nirvana. This term is found in texts such as the Bhagavad Gita and the Nirvana Upanishad, likely composed in the post-Buddha era. The concept of Nirvana is described differently in Buddhist and Hindu literature. Hinduism has the concept of Atman – the soul, self asserted to exist in every living being, while Buddhism asserts through its anatman doctrine that there is no Atman in any being. Nirvana in Buddhism is "stilling mind, cessation of desires, and action" unto emptiness, states Jeaneane Fowler, while nirvana in post-Buddhist Hindu texts is also "stilling mind but not inaction" and "not emptiness", rather it is the knowledge of true Self (Atman) and the acceptance of its universality and unity with metaphysical Brahman.

Explanation:

Answer:

The concept of Nirvana is described differently in Buddhist and Hindu literature. Hinduism has the concept of Atman – the soul, self – asserted to exist in every living being, while Buddhism asserts through its anatman doctrine that there is no Atman in any being.

Explanation:

Answer:

CO(Carbon dioxide) is a compound because it is made up of atoms of carbon bonded to atoms of oxygen. Diatomic molecules are classified as elements because it consists of two atoms(the same kind) bonded together.