Which of the following best describes how carbon dioxide is released back into the atmosphere from the earth's atmosphere?

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Decayed organisms

Calcareous sediments

Photosynthesis

Respiration

answer is D.

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Detailed Solution

Respiration is the process through which carbon returns to the atmosphere as carbon dioxide.
In the process of respiration, oxygen is consumed, energy is generated, and as byproducts, both water and carbon dioxide are released. Photoautotrophs (organisms containing chlorophyll) use this carbon dioxide to perform photosynthesis, which generates sugars and other byproducts.
Respiration and photosynthesis are involved in carbon cycling.

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