Question

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

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
by planting vegetable crops

by respiration

Answer 1

Humans cycle carbon from the biosphere to the atmosphere primarily **by driving cars that use gasoline for fuel** and **by respiration**.

Driving cars that use gasoline releases carbon dioxide into the atmosphere as a byproduct of burning fossil fuels, while respiration by humans and other living organisms releases carbon dioxide when they metabolize organic matter for energy.

Between the options provided, the most direct way humans cycle carbon specifically from the biosphere to the atmosphere would be **by driving cars that use gasoline for fuel**.

However, **by respiration** is also a valid response, as it captures the natural biological process.