Response:
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Immortal Jellyfish bodies comprise of 95% water with no brain or blood fluid at all. When things get rough for them they can begin to regrow their body parts as new simplified cells and this process is called transdifferentiation. During this process the jellyfish come to the surface of the ocean and slowly turn into a blob. This process also has been found in other animals too, but what makes the process different for the Immortal Jellyfish is that they can regenerate their entire body and other animals can only regenerate some parts of their bodies. After the transdifferentiation process is done the jellyfish become a new perfectly formed medusa stage again.
Movement:
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Immortal Jellyfish doesn't have any muscle tissues, so they use their epidermis, outer part of their skin, as muscles to help them move. They also use the ocean current to move around in the ocean and without ocean current they can't survive either, because they need the current for diffusion, to transport the nutrients throughout their bodies. They are originally from the Caribbean Sea, but since they use ocean current and ships that are leaving the port, now they can be found almost everywhere in the world that has a warm sea water.