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The thin boundary that surrounds every cell and controls what enters and leaves is the:

ACytoplasm
BCell wall
CCell membrane
DNucleus
Answer & Solution
Correct answer: C. Cell membrane
The cell membrane (plasma membrane) is the universal feature of all cells — present in both plant and animal cells. It controls the selective entry and exit of substances. Plant cells also have a rigid CELL WALL outside the membrane, but animal cells don't.
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