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Answer :
The water makes their muscles do this
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Jellyfish and octopuses move by employing jet propulsion, acting on their hydrostatic skeleton or mantle cavity to push water out and propel themselves in the opposite direction.
Animals such as jellyfish and octopuses use jet propulsion to move through water. Their muscles act on a hydrostatic skeleton or, in cephalopods, the mantle cavity. By contracting, they force water out of their bodies, propelling themselves in the opposite direction. This is based on the principles of the conservation of momentum. Jellyfish have a simpler structure and fill their umbrella section with water, then push it out. In contrast, cephalopods like squid and octopuses have more control over their movement as they can aim their nozzle to direct the jet of water, allowing them to move at speeds of 8 to 12 km/h and to escape predators by rapidly ejecting ink.
