Question

what process adds carbon dioxide to the air?
nitrogen cycle
water cycle
respiration
photosynthesis

Explanation:

• The nitrogen cycle involves nitrogen, not carbon dioxide, so it's incorrect.
• The water cycle deals with water movement, not carbon dioxide addition, so it's incorrect.
• Respiration is the process where organisms (plants and animals) break down glucose and release carbon dioxide into the air.
• Photosynthesis uses carbon dioxide and releases oxygen, so it removes carbon dioxide from the air, not adds it.

Answer:

C. respiration