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One of the most impressive photosynthesizers is a cyanobacterium called Prochlorococcus. It is estimated to be more abundant than any other photosynthesizer on the planet, and to be responsible for producing 20 percent of the oxygen in the atmosphere.
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Meet the obscure microbe that influences climate, ocean ecosystems, and perhaps even evolution

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A bloom of algae from up above
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What Exactly Is a Red Tide?

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