History of Life Events in Order
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Biology
Last updated 10:41 PM on 3/19/26
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7 Terms
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About 4.5 BYA
Formation of Earth
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3.5-4.0 BYA
Origin of life with simple celled microorganisms (prokaryotes)
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2.7 BYA
Appearance of free oxygen in atmosphere because of photosynthetic bacteria
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2.0 BYA
Origin of first eukaryotes with the development of internal membranes
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1.5 BYA
Development of first multicellular organism
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543 MYA
Cambrian Explosion
Diversification of animals
Within 10-20 million years most of the major phyla of animals appear in fossil record
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About 500 MYA to present
Colonization of land by plants and animals, then appearance of humans.
