... molecules, biological molecules, proto cells, and advanced metabolism (BSCS). In the 1920's, two men named Alexander Oparin and J.B.S. Haldine independently developed the first extensive hypothesis about how life may have originated (BSCS). Developing an idea called the Heterotroph Hypothesis, they assumed that life processes developed very gradually (BSCS). The first organisms were heterotrophs, while Autotrophs evolved later, and photosynthesis resulted in the oxygen ... ...

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• Grade Level: High School