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2 years ago

What kind of substance aquatic birds use to coat their feathers?

1 answer:

8 0

Marine birds or aquatic birds secrete a greasy oily substance that is mainly composed of quite unusual lipids. These birds have an organ called a preen gland also uropygial gland located at the back near the base of the tail that is responsible for the secretion of this substance.

The birds apply this oily substance over their feathers by rubbing their bill and head over the uropygial gland then rubbing off the accumulated oil quite thoroughly over the feathers of wings, back and every accessible part including the skin of their legs and feet.

This oil produces a waterproofing effect on the birds' feathers and thus they do not get wet but water simply runs off their surface.

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ndividuals III-6 and III-7 have two little monstersand are expecting a third one. Their two childrenhave two eyes. What is the c

CaHeK987 [17]

Answer:

The correct answer is - 75% or 3/4.

Explanation:

In the given question, there is a cross between III-6 and III-7 that produced two double eyes monsters and expected one more. As given in the image that the A or single eye is dominant over the a or double eye then both parents must be heterozygous as they produced double eye offspring (aa) and they do have only one eye.

then chances of single eye offspring would be -

cross: Aa and Aa

gametes: A, a and A, a

Punnett square:

A a

A AA Aa

a Aa aa

so there are 75% chances to have a single eye and 25% chances for a double eye.

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3 years ago

Determine if this passage is an argument or nonargument: Evolution is central to vertebrate biology because it provides a princi

attashe74 [19]

Answer:

C). Argument; conclusion: Classification,...a method of understanding evolution.

Explanation:

An argument is characterized as 'a series of propositions organized so that the final proposition is a conclusion that is intended to follow logically from the previous propositions.' The given passage exemplifies an argument as it puts forward a claim that can be argued upon if it is true or not and supported through adequate reasoning. <u>The factual evidences are provided to support the validity of the proposition and the conclusion that 'classification initially a process...understanding evolution' is compelled</u>. Thus, <u>option C</u> is the correct answer.

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2 years ago

Suppose corinna undergoes a surgical procedure in which a catheter is inserted into her blocked artery and a balloon is inflated

Misha Larkins [42]

Balloon catherisation (angioplasty)

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3 years ago

Read 2 more answers

Which reason best explains why living things need carbon?

mojhsa [17]

Carbon is an important component in living things as it is present in the food of living things in the form of saccharides such as glucose and polysaccarhides such as starch. Hence the answer to this problem should have to be A. Carbon is a source of energy.

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3 years ago

Read 2 more answers

Natural selection ________. Question 2 options: A) results in evolutionary adaptation B) is a very rare phenomenon C) does not a

Mnenie [13.5K]

Answer:

A) results in evolutionary adaptation

Explanation:

Natural selection is the process in which organism with specific traits are able to survive than others. Natural selection allows the fittest to survive while eliminating the others. It prepares the species for environmental changes by resulting in evolutionary adaptation.

Evolutionary adaptation occurs when species goes through certain processes (hereditary, habits, Physical structures) to become fit in environment. These changes help the organism to evolve to adopt the changing environmental conditions.

Example; Sweating in human.

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3 years ago