Question

Question
How do humans cycle carbon from the biosphere to the atmosphere?(1 point)
Responses

by driving cars that use gasoline for fuel
by driving cars that use gasoline for fuel

by respiration
by respiration

by planting vegetable crops
by planting vegetable crops

by eating plants

Answer 1

Humans cycle carbon from the biosphere to the atmosphere primarily **by respiration**. During respiration, humans and other organisms breathe in oxygen and release carbon dioxide back into the atmosphere as a byproduct of converting food (which contains carbon) into energy.