The first organisms that oxygenated the atmosphere were _______. a. Cyanobacteria b. Phototrophic organisms c. Anaerobic organisms

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The first organisms that oxygenated the atmosphere were _______.

a. Cyanobacteria

b. Phototrophic organisms

c. Anaerobic organisms

d. All of the above

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Concepts Of Biology

ISBN: 9781938168116

1st Edition

Authors: Samantha Fowler, Rebecca Roush, James Wise

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