Question

in regards to cellular metabolic processes, how do carbon dioxide levels in the air remain generally balanced?
photosynthesis uses up carbon dioxide, while cellular respiration creates more of it.
the earth uses up carbon dioxide, and photosynthesis and cellular respiration replace it.
cellular respiration uses up carbon dioxide, while photosynthesis creates more of it.
both photosynthesis and cellular respiration use up carbon dioxide, and the earth replaces it.

Explanation:

Photosynthesis is the process by which plants use carbon dioxide and water to produce glucose and oxygen. Cellular respiration is the process by which cells break down glucose to produce energy, carbon dioxide, and water. The balance of carbon dioxide in the air is maintained because photosynthesis uses up carbon dioxide while cellular respiration produces it.

Answer:

Photosynthesis uses up carbon dioxide, while cellular respiration creates more of it.