Home Animals Why don’t people have a third century?

Why don’t people have a third century?

by Joel Brown

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The third eyelid, which is a fold of the conjunctiva, a thin mucous membrane covering the whites of the eye, is present in a number of species of mammals, birds, reptiles, fish and amphibians.

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It protects the organs of vision, removes from them, and also carries out the distribution of tears on the surface of the eyeball, preventing it from drying out.

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