A mosaic of images from NASA's Aqua satellite taken on May 29 shows an ongoing phytoplankton bloom in the Black Sea. Norman Kuring, Ocean Biology Processing Group/NASA hide caption

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Norman Kuring, Ocean Biology Processing Group/NASA

Plankton collected in the Pacific Ocean with a 0.1mm mesh net. Seen here is a mix of multicellular organisms — small zooplanktonic animals, larvae and single protists (diatoms, dinoflagellates, radiolarians) — the nearly invisible universe at the bottom of the marine food chain. Christian Sardet/CNRS/Tara Expeditions hide caption

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Christian Sardet/CNRS/Tara Expeditions

Revealed: The Ocean's Tiniest Life At The Bottom Of The Food Chain

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