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Chemical changes describes the chemical changes on the earth that gives rise to the forms of life. According to a theory , this evolution takes place in four stages. 
1st stage : Molecules in the primitive environment form into simple organic                               molecules like amino acids. 
2nd stage : The simple organic molecules which were formed earlier are                                   accumulated and joined together into large molecules. eg : proteins 
3rd stage : The chemical evolution says that polymers interacted with each other                      and formed into protobionts. 
4th stage :These protobionts developed the ability to reproduce and pass the                          genetic information from one generation to the next.
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