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Phytoplankton are microscopic plants in the oceans.

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Countless...

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...and the number of different kinds hard to quantify.

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That's biodiversity, and it's a delicate balance.

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Oceans cover the Earth, so phytoplankton health matters to you, too.

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NASA's PACE mission will keep an eye on these little guys....from space.

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PACE: Skies, oceans, life.