Last updated: October 13, 2017 at 15:18 pm
Larvae of marine zooplankton can see with just two cells as they search for phytoplankton near the surface. This is believed to be the simplest vision system in the world.
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Jeffrey Gallant is the Editor-in-Chief and Records Keeper of the Diving Almanac. He is also a contributing editor of DIVER Magazine, and the scientific director of the Greenland Shark and Elasmobranch Education and Research Group (GEERG). Jeffrey started diving in 1982.