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Phytoplankton-tiny, photosynthetic organisms-are essential to life on Earth, supplying us with roughly half the oxygen we breathe. Like all other life forms, phytoplankton require the element phosphorus to carry out critical cellular activity, but in some parts of the world's ocean, P is in limited supply. How do phytoplankton survive when phosphorus is difficult to find? [Source: Woods Hole Oceanographic Institute]
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