A Brief Account of Evolution

 

7.8 A Brief Account of Evolution

About 2000 million years ago (mya) the first cellular forms of life appeared on earth. The mechanism of how non-cellular aggregates of giant macromolecules could evolve into cells with membranous envelop is not known. Some of these cells had the ability to release O2.
 The reaction could have been similar to the light reaction in photosynthesis where water is split with the help of solar energy captured and channelised by

 

 

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