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History of life on Earth

Formation of Earth and early life

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Earth formation
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Beginnings of life
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Origins of life
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Hypotheses about the origins of life
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The diversification of life

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Ozone layer and eukaryotes show up in the Proterozoic eon
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First living things on land clarification
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Biodiversity flourishes in Phanerozoic eon
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Human evolution overview
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Radiometric dating

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Chronometric revolution
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Carbon 14 dating 1
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Carbon 14 dating 2
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Potassium-argon (K-Ar) dating
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K-Ar dating calculation
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Atomic number, atomic mass, and isotopes
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About this unit

Our planet has an amazing history spanning about 4.5 billion years! Learn more about how Earth formed, the early history of life on Earth, and the origins of humans.
Biology is brought to you with support from the Amgen Foundation