Sleep Evolved Before Brains. Hydras Are Living Proof
The hydra is a simple creature. Less than half an inch long, its tubular body has a foot at one end and a mouth at the other. The foot clings to a surface underwater—a plant or a rock, perhaps—and the mouth, ringed with tentacles, ensnares passing water f
https://www.greenground.it/2021/05/31/sleep-evolved-before-brains-hydras-are-living-proof/
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