Question

question 1-12
co₂ is returned to the atmosphere by all methods except
combustion.
respiration.
decomposition.
photosynthesis.

Explanation:

Combustion of organic - matter releases CO₂. Respiration in living organisms produces CO₂. Decomposition of dead organisms also releases CO₂. Photosynthesis, on the other hand, takes in CO₂ from the atmosphere and uses it to produce glucose and oxygen.

Answer:

photosynthesis