O2 levels
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8 Terms
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When did earth become into existence
4,6 billion years ago (byo)
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When did life if earth begin
3,8 billion years ago
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How where the O2 levels when earth formed
Very low
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What were the first forms of life
prokaryotes that did not need oxygen, they respired anaerobically so obtained energy from food without O2
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When did different types of bacteria form with what ability
3,5 and 2,5 billion years ago with the ability to photosynthesise and produce their own food.
Carbon dioxide was used and O2 was released
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What happened when the O2 levels increased
Oxygen-dependent (aerobic organism) developed
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What did increase of oxygen result in (living organisms)
Increase variety of living organisms on earth
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