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The cell membrane only lets some molecules in and out because it is living. semi-permeable. flexible. non-permeable.

User MZD
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2 Answers

3 votes
Semi permeable
Semi meaning like some and permeable is like pass through so some pass through.
User Icanhazbroccoli
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7 votes
the cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out
User Dratewka
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