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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 .
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4 votes
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
.

User ChrisY
by
5.1k points

2 Answers

2 votes

Answer:

D

Step-by-step explanation:

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

User ILiA
by
5.2k points
3 votes

Answer:

D

Step-by-step explanation:

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

User Alex Spangher
by
4.9k points
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