The ocean's most abundant 'loner' microbe has a sticky second life

The oxygen in about every other breath we take comes from microscopic cells—phytoplankton—drifting in the surface of the ocean. Among them is Prochlorococcus, the smallest and most abundant photosynthetic organism in the seas. It single-handedly accounts for roughly 10% of all the carbon that the land and the oceans pull from the atmosphere each year.

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