Last updated: October 1, 2017 at 19:11 pm
Freshwater hydra can regenerate, which allows them to recover from injury and to reproduce asexually. Hydra cells continually divide and do not appear to undergo senescence (aging), and like jellyfish, hydra have no brain, no respiratory system or musculature.
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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.