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Examen
BIOL 351 TAMU EXAM 1 Test Questions and Answers Rated A
NuevoBIOL 351 TAMU EXAM 1 Test Questions and Answers Rated A 
When did the Earth form? ~4.6 billion years ago 
When did life arise? ~3.6 billion years ago 
Formation of Earth 
Hadean Eon (4.6-3.8 bya) 
Archaean Eon (3.8-2.5 bya) 
Proterozoic Eon (2.5 BYA- 542 MYA) 
Formation of the crust and oceans 
Origins of cellular life 
Divergence of Bacteria and Archaea 
Origins of anoxygenic photosynthesis 
Origins of cyanobacteria and oxygenic photosynthesis 
Start of the G