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November 26 2014
possibly emerged from combination of Prokaryotes
Cambrian explosion happened in water!
Plant life on land
1) support structure: woody tissue
2) Internal aquatic enviroment: internal channels
Seedless: dump spores
Gymnosperms: cones / dump-sperm
Angiosperms: flowers / pollinations
Animal life on land
Extinction events tend to be followed by periods of rapid change