Single celled

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First life characteristics

• Single celled
• Prokaryotic
• Heterotrophic
• RNA as genetic material

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Fossil bacteria 3.5bya
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65mya
251mya
543mya
4.6bya
3.8bya
1.5bya multicellular
2.2bya O2 plentiful eukaryotes
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Early multicellular life (1.3bya)
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Burgess Shale
Paleozooic - Cambrian
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P - Ordovician
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P - Silurian
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P - Devonian
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P - Carboniferous
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P - Permian
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Mesozoic Triassic, Jurassic, Cretaceous
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Quaternary Age of Man
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Cenozoic
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