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How have human activities changed Earth's atmosphere over the past 200 years? A. They have increased the levels of greenhouse gases. B. They have reduced the level of nitrogen gas. C. They have increased
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How have human activities changed Earth's atmosphere over the past 200 years?

A. They have increased the levels of greenhouse gases.
B. They have reduced the level of nitrogen gas.
C. They have increased the level oxygen gas.
D. They have reduced the levels of greenhouse gases.

User Prospector
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2 Answers

3 votes

Answer:

100% A

Explanation: cuz im doing the text rn

User PVilaca
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1 vote

Answer: A

Step-by-step explanation:

Because I did this before

User Blagus
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5.4k points
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