Answer:
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:
Hope this helps! <3
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