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A ctenophore is a small marine animal, usually with two long tentacles, that preys on tiny targets in the ocean’s photic (light) zone, including plankton, fish eggs, larvae, other ctenophores, and other tiny organisms generally around 1 mm in size. Ctenophores are sometimes called comb jellies, despite their relative complexity in comparison to jellyfish. Some ctenophores are bioluminescent, but this is only visible in complete darkness
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