Question

part c
water crosses the plasma membrane
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against its concentration gradient
using a process that requires energy from the cell.
through cotransport.
through facilitated diffusion or diffusion.
through active transport.
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part d
the sodium - potassium pump uses energy from atp to move sodium ions out of the cell, and potassium ions into the cell. this is an example of
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passive transport.
facilitated diffusion
diffusion
exocytosis
active transport.
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Explanation:

For Part C, water crosses the plasma membrane through facilitated diffusion (using aquaporins) or simple diffusion, moving down its concentration gradient and not requiring energy from the cell. For Part D, the sodium - potassium pump uses ATP energy to move ions against their concentration gradients, which is the definition of active transport.

Answer:

Part C. through facilitated diffusion or diffusion
Part D. active transport