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5 votes
Riddle #3

I am a thin protective layer around the cell, but
I am not one solid piece. I have tiny openings
that allow materials to pass in and out.
I am the


PLEASE HELP

1 Answer

6 votes

Answer:

The Membrane

Step-by-step explanation:

The membrane of the cell has proteins, pumps, transporters, and channels embedded sporadically through it that allow molecules that cannot cross freely to enter the cell.

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