Question

based on the graphic shown, which two important natural processes release carbon into our atmosphere? a photosynthesis and decomposition b decomposition and respiration c photosynthesis and respiration d deforestation and decomposition

Explanation:

• Decomposition: When organisms die, decomposers break down their organic matter. Carbon - containing compounds in the dead organisms are converted into carbon dioxide (\(CO_2\)) and released into the atmosphere. For example, when a tree dies and fungi decompose it, carbon stored in the tree is released as \(CO_2\).
• Respiration: Both plants and animals (and other organisms) carry out cellular respiration. The chemical equation for cellular respiration is \(C_6H_{12}O_6+6O_2

ightarrow6CO_2 + 6H_2O+\text{Energy}\). Organisms use glucose (\(C_6H_{12}O_6\)) and oxygen (\(O_2\)) to produce carbon dioxide (\(CO_2\)), water (\(H_2O\)), and energy. The \(CO_2\) is then released into the atmosphere.

• Photosynthesis: The chemical equation for photosynthesis is \(6CO_2+6H_2O

ightarrow C_6H_{12}O_6 + 6O_2\). Plants take in \(CO_2\) from the atmosphere and use it (along with water) to produce glucose and oxygen. So, photosynthesis takes in carbon (in the form of \(CO_2\)) from the atmosphere, not release it.

• Deforestation: While deforestation can lead to carbon release (because when trees are cut and decompose or are burned, carbon is released), deforestation is a human - induced activity, not a natural process as the question asks for.

Answer:

B. decomposition and respiration