Answer:
Sometimes, molecules cannot move through the cell membrane on their own. These molecules need special transport proteins to help them move across the membrane, a process known as facilitative diffusion. ... Many channel proteins allow the diffusion of ions. Ions are charged atoms.
Explanation:
The answer to this question is B hope
Hope this helps
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Answer:
I believe it's B, its been a while since I last studied cells so I might be wrong
Explanation:
Gamma rays because microwaves, visible light and radio waves wouldn’t come in handy if an astronomer would want to study the composition of planets and stars.
