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2014-07-18T21:27:30+08:00

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Cell membrane..

the thin layer of protein and fat that surrounds the cell. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others.

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2014-07-18T23:05:40+08:00

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The cell membrane

>Hope it helps
don't copy my answer,it is based on my mind !!
From: TaengPark
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