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Sessility, a property of certain animals, is a lack of self-locomotion. Sessile animals do not have natural motility, and are immobile unless there are external forces (such as water currents). Usually, sessile animals are permanently attached to a solid object, such as a rock, a dead tree trunk, or a human-made object such as a buoy or ship's hull. Organisms such as corals lay down their own substrate

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