How do hydras, sea anemones, jellyfish move?

Jellyfish move with a sharp push of water from under the bell, which gives a powerful push.
The anemones move by slow relaxation and contraction of the sole.
The hydra moves by bending its body, attaching itself with tentacles to something, it raises the sole upward and places it near the mouth.
also moves along the plane using tentacles.



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