Suppose you traveled back in time and located the first animals to have evolved feathers. You found that these animals were tree-dwelling ectotherms, able to run quickly but unable to fly. You also noticed that only males had feathers. Which hypothesis of feather evolution would these data most support? Feathers initially evolved in a role associated with ________.

Answers

Answer 1

Answer:

Feathers initially evolved in a role associated with sexual selection.

Explanation:

In species where only males had feathers, these feathers can be considered to have evolved into a role associated with sexual selection. This is because in these species, males used their feathers as a sexual attraction for females, in this case, females chose the males that had more attractive feathers to mate and generate new individuals for the species. An example of this can be seen in the peacock, where the tail with lush feathers is only present in males and is intended to sexually attract females.


Related Questions

An ecosystem experiences a loss of denitrifying prokaryotes. Will this loss affect the health of the ecosystem?

Answers

yes it will, it will ruin the food chain

Genetic variation is more commonly found in sexually reproducing organisms, as compared to asexually reproducing organisms, because
1 point
in asexual reproduction gametes fuse to lead to new genetic combinations
in sexual reproduction the gametes formed are all genetically identical
in asexual reproduction the gametes formed are genetically different
in sexual reproduction gametes fuse to lead to new genetic combinations

Answers

Answer:

In sexual reproduction gametes fuse to lead to new genetic combinations

Explanation:

In sexually reproducing organisms, there are two parents who create genetically diverse offspring.

This occurs because the gametes of the two parents combine to create very unique genetic combinations, which lead to increased genetic variation.

On the other hand, asexually reproducing organisms reproduce without a partner.

Their offspring are identical clones to the parent, so they have much less genetic variation.

So, the correct answer is that In sexual reproduction gametes fuse to lead to new genetic combinations.

Place the steps shown below in the correct order.
2.3.1.5.4
2.1.3.4.5
04.1.3.5.2
1.3.4.5.2
2.4.3.1.5

Answers

Answer:

option 2. 2.1.3.4.5

Explanation:

This is the accurate answer... that is the correct steps of mitosis

In meiosis, sister kinetochores are attached to the same pole of the cell during meiosis I, and sister chromatid cohesion is released during anaphase II. What would be the likely result if sister kinetochores were attached to different poles of the cell during meiosis I and sister chromatid cohesion was released during anaphase I

Answers

Answer:

sister chromatids would migrate to opposite poles in anaphase I

Explanation:

Kinetochores are multiprotein structures that establish the attachment of spindle microtubules to the chromatids during cell division (either mitosis or meiosis). Sister chromatid cohesion at the centromeres refers to the mechanism by which sister chromatids are paired and held together during meiosis I. This process (sister chromatid cohesion) is fundamental to ensure the correct orientation of chromatids on the spindle microtubules and their subsequent segregation in meiosis II. The fusion of sister kinetochores in meiosis I underlies sister chromatid cohesion during this stage of the cell division, thereby their disruption or destruction of sister chromatid cohesion would lead to separation and segregation of sister chromatids to opposite poles of the cell in anaphase I.

Choices:

Why are reflex actions rapid and automatic? *

1. They do not go to the brain.
2. They do not go to the spinal cord.
3. They involve the conscious part of the brain.
4. They do not involve the conscious part of the brain.

Answers

Answer:

4. They do not involve the conscious part of the brain.

Explanation:

A reflex action follows this general sequence and does not involve the conscious part of the brain. 

give a short introduction of carl von linnaues and rh whittakers regarding classification of living beings one major point​

Answers

Carl von Linnaeus and Rh Whittaker’s are good people

Ans:using a filament of spirogyra in a laboratory Demonstrate how plasmolysi wil occur​

Answers

Answer:

plasmolysis is the shrinkage of protoplast from the cell wall under the influence of a hypertonic solution.this can be observed by placing the fresh filament of spirogyra in a 10% solution of common salt.the cell undergoes exomosis.

I hope this helps

answer h and i urgently
no explanation needed ​

Answers

Answer:

h. I think option c growth of an organism in not true

C
I think its the best answers

C What is the important of making prority

Answers

Answer:

Priorities will guide you in life's decisions and keep you on track. Most importantly, priorities will give you the confidence to say "no." They help you identify what's truly needed in your life, versus what someone else feels is important.

Answer:

The importance of it are Establishing priorities is necessary in order to complete everything that needs to be done. Prioritization is important because it with allow you to give your attention to tasks that are important and urgent so that you can later focus on lower priority tasks.

the personality of an individual involves his or her​

Answers

Answer:

both

Explanation:

depends on the person's personality I guess or how they act n all

Do populations of different species of birds that live in the same community compete? Explain.

Please help me

Answers

Absolutely. These birds will be fighting over land, food, and other resources in the finite ecosystem they share. Competition is part of natural selection, and it’s part of these ecosystems.

Hyperscience is...
1. Genetically modifying plants.
2. quickly producing new plant varieties.
3. growing plants using new technology.
4. responding to the horticulture market.

Answers

Answer:

2

Explanation:

If the results of an experiment are considered valid they will? A. Give the same nontestable results B. Give The same outcome when repeated C. Give different outcomes in different parts of the world D. give different results from repeated by different scientist

Answers

Answer:B

Explanation:

If it's valid, then it has substantial evidence to back up the results, which will  be the same over and over again.

for fun

if you had to choose what animal would you be^-^

Answers

Answer:

Husky. Why not?

Explanation:

From earliest to latest, the overall sequence of early development proceeds as follows: A) gastrulation → organogenesis → cleavage B) ovulation → gastrulation → fertilization C) cleavage → gastrulation → organogenesis D) gastrulation → blastulation → neurulation E) preformation → morphogenesis → neurulation

Answers

Answer:

C) cleavage → gastrulation → organogenesis

your welcome!

Soil moisture influences both hydrological and agricultural processes and is part of the water and energy cycles through ________.

transpiration
evapotranspiration
evaporation
condensation

Answers

Answer:

Its either evapotranspiration or condensation

Explanation:

Hope it helps✌✌

Answer:

The correct answer is evapotranspiration.

Explanation:

Evapotranspiration is the process of water moving from Earth's surface to the atmosphere. The way water moves from the soil to atmosphere is through this process.

The organs in the human body perform specific functions for survival.

Organ A delivers blood to the body
Organ B delivers oxygen to the body
Organ C delivers messages to the body

Which of the following correctly identifies the organs that perform each function above?

Organ A is the heart, Organ B is the brain, and Organ C is the lungs
Organ A is the heart, Organ B is the lungs, and Organ C is the brain
Organ A is the lungs, Organ B is the brain, and Organ C is the heart
Organ A is the lungs, Organ B is the heart, and Organ C is the brain

Answers

Organ A is the heart

Organ B is the lungs

Organ C is the brain

Because heart only delivers blood to lungs and other body tissues, Lungs input oxygen into the blood and brain sends signals and messages to the body parts.

This is the answer. Hope it helps you

Answer:

B) Organ A is the heart, Organ B is the lungs, and Organ C is the brain

Explanation:

For the numbered steps below, select the option that places them in the correct order. 1) The ribosome binds to the mRNA and uses tRNAs to translate mRNA into the corresponding amino acid polypeptide sequence. 2) The spliceosome removes introns. 3) The primary structure of the polypeptide chain undergoes hierarchical foldings to form the tertiary structure. 4) RNA polymerase binds to the promoter region of a gene and initiates transcription.

Answers

Answer:

first 4, then 2, then 1, and lastly 3

Explanation:

First, RNA polymerase binds to the promoter region of a gene on the DNA and initiates transcription. Transcription is the process by which we get mRNA (coding RNA) which is used as a template for protein synthesis. Then, in transcription, the resulting mRNA undergoes modification and maturation. This  involves removal of introns, addition of 3'-poly-A tail and 5'-cap. Introns are sequences that do not code for protein and are hence removed. The structure that removes introns is the spliceosome. Thirdly, mature mRNA travels to the cytoplasm. Ribosome (composed of rRNA) binds to mRNA and tRNA to start the process of protein synthesis. The process of formation of protein is called translation. Lastly, the primary structure of protein may undergo folding to form a tertiary structure.

What is the Constant of “which bait works best for a fly trap?”

Answers

Answer:

Mix scraps of meat (the older, the better) with something sweet. Lots of people swear by using rotten fish or shrimp, which probably work best because they smell so much. Bait for Fruit Flies: Use fruit (the riper, the better), apple cider vinegar, fruit juice, syrup, wine, beer, or any combination

You observe a cell in a stained section of connective tissue. The cell has an indented nucleus and obvious cytoplasmic granules. Upon further testing, you determine that the granules contain histamine. This cell is most likely a(n) _____. Multiple choice question. mature neutrophil mast cell eosinophil B cell

Answers

You observe a cell in a stained section of connective tissue. The cell has an indented nucleus and obvious cytoplasmic granules. Upon further testing, you determine that the granules contain histamine. This cell is most likely a(n) _____.

mast cell

Plz answer this. I miss typed it as advanced placement.​

Answers

Answer:

option 1

Explanation:

Answer:

a and R

are correct

Explanation:

According to the ESRT, the rate of temperature increases below the Earth's surface is greatest between depths of

Answers

Answer:

Between depths of tectonic plate boundaries and the outer core.

Explanation:

The rate of temperature increases below the Earth's surface is greatest between depths of tectonic plate boundaries and the outer core.  At the depth, some of the heat comes from the Earth's core while most of the heat comes from decay of radioactive elements, mainly uranium, thorium and potassium that is located in rocks of the crust. So we can say that the the increase in temperature with depth varies with the chemical composition and age of the rocks.

One gene pair can influence other gene pairs, with their combined activities producing some effect on phenotype; this called ________________. In Labrador retrievers, one gene pair codes for the quantity of melanin produced while another codes for melanin deposition. Still another gene locus determines whether melanin will be produced at all--lack of any produces an albino (recessive).

Answers

Answer:

Epistasis

Explanation:

Genetics can be defined as the scientific study of hereditary in living organisms such as humans, animals and plants

In Genetics, a gene pair has the ability to influence other gene pairs based on their combined activities which produces some effect on phenotype; this is called epistasis.

Which of the following would be examples of abiotic factors in a mountain river ecosystem?
fish, algae, and sand

sand, water, and fish

sand, water, and minerals

water, fish, and algae

Answers

Sand , water , and minerals

que es la iniciación de un cultivo

Answers

Answer:

cuando un cultivo inicia y se empieza a arar la tierra

Explanation:

oil-rich countries in the middle east cover about 4% of earth's total land area but posses about 48% of the world's known oil reserves. what is the main reason for high concentration of reserves in this part of the world?

Answers

The correct answer is A. Geological processes.

Explanation

Oil is a hydrocarbon of fossil origin by geological processes that transforms large amounts of organic matter deposited on anoxic bottoms of seas or lake areas of the geological past, which were later covered by heavy layers of sediment. This causes organic materials to be transformed into oil by the heat and pressure of the upper layers. However, this phenomenon does not occur in all parts of the earth because in some, as in the case of the Middle East, there were large amounts of organic matter that became an oil reserve. So the correct answer is A.

the results of an experiment can be validated through replication true or false​

Answers

Answer:

True through replication

Answer:

this is true

Explanation:

A man is brachydactylous (very short fingers; rare autosomal dominant), and his wife is not. Both can taste the chemical phenylthiocarbamide (autosomal dominant; common allele), but their mothers could not. Give the genotypes of the couple. If the genes assort independently and the couple has four children, what is the probability of all of them being brachydactylous

Answers

Answer:

The correct answer is -

A) BbTt x bbTt

B) .5^4 or 1/16 or 0.0625

Explanation:

As it is given that Brachydactylus and PTC tasters both traits are autosomal dominant conditions which mean only one allele would be enough.

For Branchydactylus and For tasting :  man and women will be heterogeneous.

Hence,

The Genotype of man = BbTt

The Genotype of wife = bbTt

b. Answer = 0.0625

For Branchydactylus:

Bb X bb

Possible genotypes:

B b

b Bb( Brachydactylus) bb(normal)

b Bb (Brachydactylus) bb (normal)

The probability of a single child being Branchydactylus = 2/4 = 0.5

So,  Probability of all 4 child being Branchydactylus = .5 x .5 x .5 x .5 = 0.0625

What is atom in a chemical reaction?​

Answers

Answer:

the atoms are molecules that react with each other, they're called reactants

Explanation:

Động vật nào sau đây máu đu nuôi cơ thể không pha trộn giữa máu giàu o2 và máu giàu co2

Answers

Answer:  Tôi không thể giúp anh vì anh chưa bao giờ đặt tên cho bất kỳ con vật nào

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