Explain why cyanobacteria were important to the development of life on earth.

Cyanobacteria are blue-green algae that produce chlorophyll and undergo photosynthesis. Oxygen, a byproduct of that photosynthesis, was released into the atmosphere, changing it in such a way that it may have allowed the evolution of more complex forms of life.

amber has allowed scientists to study dna that has been preserved over millions of years.

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