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Which gas forms 21% of Earth's atmosphere?

A.
argon
B.
carbon dioxide
C.
nitrogen
D.
oxygen

User Trusk
by
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2 Answers

4 votes

Answer:

D.) Oxygen

Step-by-step explanation:

78% Nitrogen 21%Oxygen 1%Inactive gases

User Joshweir
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4.6k points
7 votes
Oxygen is the correct answer
User ThomasWeiss
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