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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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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

User Kayleigh
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f photosynthetic bacteria
User Krastanov
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