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Pretty sure it's D.

Photosynthesis is an important part of the carbon cycle, due to the massive use of carbon during its life. Plants take in carbon and release oxygen to survive and help them live, which lets us survive as well. Respiration is in our bodies, made up of our lungs, which helps with gas exchange. Therefore, another part of the carbon cycle due to the intake and release of carbon and oxygen.

Explanation:

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.