What are tiny, single-cell creatures that scientists believe were instrumental in the development of evolution?
a. cnidaria
b. cyanobacteria
c. meroplankton
d. mixotrophs

I believe these tiny, single celled creatures that scientists believe were fundamental in the development of evolution would have been Cyanobacteria. As these bacterial organisms, play a very important role in helping to change the concentration of gases present in the atmosphere.

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Explanation:

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