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18 votes
Monitoring levels of which two gases would help determine the human

impact on air quality?
A. Methane
I B. Water vapor
I C. Carbon dioxide
✓ D. Oxygen

User Emerald
by
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2 Answers

5 votes
D.) Oxygen

i hope this helped...
User Frodopwns
by
8.5k points
3 votes

Answer:

oxygen is the answer......

User TehBoyan
by
8.2k points

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