what is Hydra?What is the function of Hydra?
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Hydras move their bodies about in the water while they are attached, extending and contracting by a mixture of muscle movement and water (hydraulic) pressure. This hydraulic pressure is created inside their digestive cavity.
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In modern English, hydra or hydra-headed can describe a difficult or multifarious situation. The name hydra has been assigned to a genus of invertebrate freshwater animals having a circlet of 4 to 25 tentacles on one end of its tubelike body.
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