Jon is researching the oxygenation of Earth's atmosphere. Which unicellular organism do biologists consider to be the main contributor to that process?

A. paramecia

B. amoebae

C. dinoflagellate

D. cyanobacteria

Answer is D. cyanobacteria

I know this is going to be a little vague, but here goes. Any information about veterinary sciences would be greatly appreciated. This is just to give me some new facts and things to learn about.

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