The first organisms that oxygenated the atmosphere were _______. a. Cyanobacteria b. Phototrophic organisms c. Anaerobic organisms
Question:
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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Related Book For 
Concepts Of Biology
ISBN: 9781938168116
1st Edition
Authors: Samantha Fowler, Rebecca Roush, James Wise
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