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History of Life (major dates)
The major dates in the history of life, from the formation of the Earth to the appearence of the first hominid.
14
Biology
Undergraduate 1
02/13/2011
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Term
Earth Forms
 Definition
4.5 BYA
Term
First Prokaryotes
 Definition
3.8 BYA
Term
First Eukaryotes
 Definition
2.5 BYA
Term
Free Oxygen in atmosphere
 Definition
1.7 BYA
Term
Multicellular eukaryotes
 Definition
1.5 BYA
Term
First animals
 Definition
590 MYA
Term
Cambrian explosion
 Definition
540 MYA
Term
First vertebrates
 Definition
520 MYA
Term
Colonization of land
 Definition
440 MYA
Term
First tetrapods
 Definition
400 MYA
Term
First reptiles
 Definition
300 MYA
Term
First mammals
 Definition
225 MYA
Term
First flowering plants
 Definition
135 MYA
Term
First hominid
 Definition
7 MYA
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