Why do the phospholipid surrounding the cell form a bilayer

 because the properties of polar heads and nonpolar tails cause the phospholipids to arrange themselves in layers. ... Some proteins extend through one or both phospholipid layers and help materials cross the membrane.

Explanation:

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.