What is the function of collecting duct in kidneys?

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Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why ?

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The glomerular filtrate in the loop of Henle gets concentrated in the descending and then gets diluted in the ascending limbs.Explain

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(i) Study the given structure carefully and label the parts given as A, B, C, D and E.
(ii) Give one major function of each of these.

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With the help of suitable diagram describe the structure of human excretory system.

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Describe various steps in urine formation.

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Explain how the function of kidney is regulated in the body.

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(a)