A cell membrane protects a cell from it's surroundings. The cell membrane controls the movement of substances from the outside and inside of cells and organelles.
Either A or C, however I lean towards C more.
D is obviously not the correct answer as Social Media is typically fairly biased while B is able to be edited by the public.
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It helps you to think through your problems. It also allows you to figure out equations. Etc.....
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B a very large molecule made of smaller molecules
