sara134 sara134
  • 29-11-2016
  • Chemistry
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the first major source of oxygen gas

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Аноним Аноним
  • 29-11-2016
I would say trees and plants. They take the carbon dioxide out of our air and replace it would breathable oxygen. Hope this helps!
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popz
popz popz
  • 29-11-2016
it is going to be h2s:-)
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