Atp is required in the transport of
(a) all molecules across a membrane
(b) molecules through a protein channel
(c) molecules to areas of lower concentrations
(d) molecules to areas of higher concentrations

(d) Molecules to areas of higher concentrations

Explanation:

The use of ATP to transport substances from a low concentration region to a high concentration region is called active transport because its against the concentration gradient.

And because it uses chemical energy from ATP is called active primary transport.

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