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Origin of Life: Evolution can explain formation of many species ultimately from a single species in the past. But origin of life (first species) needs further explanation. Oparin and Haldane proposed biochemical theory of evolution : Chemical evolution : Formation of simple organic substances (amino acids, glucose, nucleotides) from inorganic substances CH4, NH3, H2S on primitive Earth. Biological/ Organic Evolution : Formation of first primitive cell using organic molecules. Evolution of different forms of life forms from simple unicellular prokaryotic organism Miller and Urey experiment : They simulated primitive earth. Primitive reducing atmosphere Gases like H2S, NH3, CH4 Evaporation from hot oceans Boiling water in flask Lightening ...
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