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a) Sarah and Joe are fighting about cell membranes. Sarah thinks that the only way something...

a) Sarah and Joe are fighting about cell membranes. Sarah thinks that the only way something can get through a cell membrane is through active pumps. She states that it is the flow from higher to lower concentration with a little sugar that moves things across the membrane. Joe says that it moves through Diffusion, and is the flow from low to high. Who is right? ​​ Support your reason by talking about Active versus Passive movement across a membrane.

b) what is facilitated transport?
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