Question

Why is the cell membrane not an absolute barrier between the cytoplasm and the external environment?

Answer 1

Explanation:Semipermeable membranes allow nutrients to enter and wastes to leave cells.

Answer 2

Explanation:

The cell membrane is partially permeable,

small,non polar and uncharged molecules can pass through the phospholipid bilayer like glucose for example , well except for water,water is the only dipolar molecule that can pass through the phospholipid bilayer (BY OSMOSIS)

channel proteins also help in facilitated diffusion,amino acid and glucose

this is the cell's way to get the nutrients it needs

hope this will help you❤️