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27 March, 10:00

During the evolution of life on Earth, the photosynthetic organisms initially responsible for raising atmospheric oxygen concentrations from less than 1 percent to about 20 percent were

(A) cyanobacteria

(B) archaea

(C) diatoms

(D) flowering plants

(E) mosses

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  1. 27 March, 10:05
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    B or A the chapter I learned talked about both
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