Question

what is called third eyelid

Answer 1

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$\bold{Q.}$What is called third eyelid?

$\bold{Ans.}$ The nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus for protection and to moisten it while maintaining vision.

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Answer 2

Explanation:

Cytoplasm is a thick solution that fills each cell and is enclosed by the cell membrane. It is mainly composed of water, salts, and proteins. In eukaryotic cells, the cytoplasm includes all of the material inside the cell and outside of the nucleus.