Geography, 29.09.2019 00:10 Dweath50

1. what is the ultimate source of all the energy that powers your cells (and > 99.9% of all life on earth)? a. when did this process evolve and how do we know? b. when did appreciable levels of oxygen (o2) begin to build up in the atmosphere? c. why was there such a long delay between the dates in part 2a and 2b above?

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