Question

by which process do plants obtain carbon from the atmosphere?
photosynthesis
cellular respiration
decomposition
consumption

Explanation:

Plants use the process of photosynthesis to take in carbon - dioxide from the atmosphere and convert it into organic compounds like glucose. Consumption is related to organisms taking in food, decomposition is the breakdown of organic matter, and cellular respiration is the process by which cells break down glucose to release energy.

Answer:

photosynthesis