Question

unit test 1 - fall2025
what is our role in the carbon cycle?
we contain carbon.
we release it into the atmosphere when using fossil fuels.
we release it into the atmosphere when we breathe.
all of the above.

Explanation:

Humans are made up of carbon - containing compounds. When using fossil fuels, large amounts of carbon dioxide are released into the atmosphere. Also, during respiration, we exhale carbon - dioxide. So all the given statements are true about our role in the carbon cycle.

Answer:

All of the above.