The first simplest oxygen producing organism:
Correct answer: B. Cyanobacteria
- A. Methanogens
- B. Cyanobacteria
- C. Euglena
- D. Spirogyra
Explanation
There is suggestive evidence that photosynthetic organisms were present approximately 3.2 to 3.5 billion years ago, in the form of stromatolites, layered structures similar to forms that are produced by some modern cyanobacteria.
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