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8 December, 01:32

Which gas forms 21% of Earth's atmosphere?

a.-argon

b.-carbon dioxide

c.-nitrogen

d.-oxygen

+2
Answers (2)
  1. 8 December, 03:30
    0
    I think the answer is d
  2. 8 December, 04:38
    0
    Oxygen makes up 21 percent
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