If you're referring to water, it's not required that you drink 8 glasses, just enough that you keep yourself hydrated.
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I don't know what it's for
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both shares plasma membrane, ribosomes, cell membrane
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will be more likely to survive, reproduce, and pass more of their genes on the next generation.
Bird skeletons are very delicate, and therefore, difficult to be preserved. The bones of the birds are soft. The small animals are very prone to physicochemical as well as biological decay. This is why the fossil record of bird is incomplete and well-preserved fossils of birds are rare to find, except at a few unusual sites.
