Question

Which of the following processes is not primarily caused by humans?

A. air pollution
B. the greenhouse effect
C. thinning of the ozone layer
D. increased carbon dioxide levels
.

Answer 1

D

Step-by-step explanation:

from my own understanding,we are not the only ones on this planet there are other animals

Answer 2

D

Step-by-step explanation:

A,B,C all caused by human. But D is less