Question

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

by respiration
by respiration

by eating plants
by eating plants

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

by planting vegetable crops

Answer 1

Humans cycle carbon from the biosphere to the atmosphere primarily **by respiration**. During respiration, humans and other animals take in oxygen and release carbon dioxide as a byproduct, thereby returning carbon to the atmosphere.