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Timeline of Life
n/a
19
Biology
10th Grade
02/10/2009
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Term
4.6 BYA
 Definition
Earth forms
Term
4.0 BYA
 Definition
Rocks & Oceans form
Term
4.6 - 3.5 BYA
 Definition
Molecules for living cells are created
Term
3.5 BYA
 Definition
Archaebacteria
Term
3.5 - 1.5 BYA
 Definition
Cyanobacteria (and oxygen) are formed.
Term
1.5 BYA
 Definition
Eukaryotic cells
Term
1.5 B - 600 MYA
 Definition
Sexual reproduction
Term
600 MYA
 Definition
Animals in Ocean
Term
500 MYA
 Definition
First vertebrates
Term
400 MYA
 Definition
Move to Land (Plants, Fungi, Animals: Arthropods, Amphibians)
Term
280 MYA
 Definition
Reptiles
Term
225 MYA
 Definition
Mammals
Term
150 MYA
 Definition
Birds
Term
65 MYA
 Definition
Primates Appear
Term
20 MYA
 Definition
Humans and Apes split from other primates.
Term
8 MYA
 Definition
Humans split from Apes
Term
3.5 MYA
 Definition
First Hominid - Australopithecus
Term
2 MYA
 Definition
First member of genus Homo
Term
200,000 YA
 Definition
Homo sapiens
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