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
Answers
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1
Answer:
C
Explanation:
because respiration occurs in animals too.
both a and b are natural disasters.
only humans use fossil fuels for energy.eg coal
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