What is cell membrane!?

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The cell membrane is a biological membrane that separates the interior of all cells from the outside environment which protects the cell from its environment. The cell membrane consists of a lipid bilayer, including cholesterols that sit between phospholipids to maintain their fluidity at various temperatures. 

Explanation:

brainliest plz

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;