Biology
Bambi552
9

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) Answers
madnaanmap

B or A the chapter I learned talked about both

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