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A gigaannum is a term that represents a very long time. One billion years in fact. About 3.5 gigaannumms ago was when what critical process used to convert light energy into chemical energy is estimated to have begun?

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1. A gigaannum is a term that represents a very long time. One billion years in fact. About 3.5 gigaannumms ago was when what critical process used to convert light energy into chemical energy is estimated to have begun?





 
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