Final answer:
Autotrophs get the carbon atoms for photosynthesis from the air.
Step-by-step explanation:
Autotrophs get the carbon atoms for photosynthesis from the air. They use carbon dioxide (CO2) from the atmosphere as a raw material for photosynthesis. During photosynthesis, autotrophs convert CO2 into glucose molecules, which store the energy needed for their survival.
Learn more about Autotrophs and photosynthesis