ES101 Lecture Notes - Lecture 26: Chemical Evolution, Prokaryote

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We have only identified about 1% of the species that have existed over the earth"s lifespan. Earth"s life is result of 1 billion years of chemical evolution to form first cells followed by 3. 7 billion years of biological evolution to form species. Evolution can be divided into two phases: Chemical evolution : formation of organic molecules, biopolymers and systems of chemical reactions needed to form first cells. Small organic molecules form in the seas. Large organic molecules (biopolymers) form in the seas. Biological evolution: singled celled prokaryotic bacteria to single celled eukaryotic creatures and then to multicellular organisms this phase has been going on for 3. 7 billion years. Single cell prokaryotes form in the seas. Single cell eukaryotes form in the seas. Variety of multicellular organisms form first in the seas and later on land. Fossils mineralized replicas of skeletons bones teeth shells leaves and seeds.

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