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Proterozoic era

The Proterozoic era (the era of early life) began 2.6 billion years ago. The surface of the Earth was a bare desert. The oxygen content in the atmosphere
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Archean era

The Archean era (the era of ancient life) began 3.5 billion years ago. Living organisms that appeared at the beginning of the Archean era were anaerobic heterotrophs and
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Embryological evidence

The study of the embryonic development of living organisms provides indisputable evidence of evolution. Embryological evidence is: the development of all sexually reproducing organisms from one cell –
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Comparative anatomical evidence

Comparative anatomical evidence for evolution includes: a similar plan of the structure of organisms of different systematic groups; live transitional forms; homologous organs; similar bodies; rudiments; atavisms. Living
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