lkanan98p0eg20 lkanan98p0eg20
  • 03-12-2017
  • Biology
contestada

What makes up 21 percent of the earths atmosphere

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bossloveswag bossloveswag
  • 03-12-2017
  the answer is 21% oxygen, 
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calliebmee1
calliebmee1 calliebmee1
  • 03-12-2017
21% oxygen.................................
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