Answer:
Carbon enters the atmosphere as carbon dioxide from respiration and combustion. Carbon dioxide is absorbed by producers to make glucose in photosynthesis.
Explanation:
The answer is respiration and combustion.
Respiration is the process of oxidation of food materials like glucose, Amino acids, and fatty acids to water and carbon dioxide. Respiration does not require any external heat to carry on the process. Combustion is only done by applying external heat to the sugar molecule to burn.
Both Respiration and Burning to use oxygen. Both Respiration and Burning produce energy. Both Respiration and Burning give out carbon dioxide as the end product. The overall chemical reactions of both Respiration and Burning are the same.
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