Question

Both human activity and natural forces contribute to the levels of carbon dioxide in the atmosphere. Which of the following contributors is caused solely by human activity?

A. volcanic eruptions
B. forest fires
C. using fossil fuels for energy
D. respiration ​

Answer 1

c

Step-by-step explanation:

the answer is c because forest fires, respiration and volcanic eruptions are not solely caused by humans, while the use of fossil fuels is