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  • 18-05-2018
  • Biology
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The oxygen content in the atmosphere of the early Earth is thought to have increased significantly once which of these developed?
f Photosynthetic bacteria
g Amino acids
h Mitochondria
j Archaebacteria

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leisurlycoinp82chd leisurlycoinp82chd
  • 18-05-2018
f photosynthetic bacteria
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