Question

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

Answer 1

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.