How is jet propulsion carried out in animals?

According to the principle of jet propulsion, a number of animals move in nature, for example, jellyfish, scallops, dragonfly larvae, squid, octopus, cuttlefish. Most jellyfish move in a reactive manner, pushing water out of the umbrella cavity. Scallop sea mollusks, usually lying quietly on the bottom, when approaching their main enemy – a delightfully slow, but extremely insidious predator – a starfish – sharply squeeze the valves of their shell, forcibly pushing water out of it. The larva of the dragonfly-rocker with confident jerks and jerks hides from the threat pursuing it.

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