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The water vascular system is a distinctive and highly specialized organ system found exclusively in echinoderms such as starfish, sea urchins, brittle stars, sea cucumbers, and crinoids. It is a hydraulic system derived from the coelom and plays a crucial role in locomotion, feeding, respiration, excretion, and sensory perception. This system is a key adaptive feature that enables echinoderms to survive and function efficiently in marine environments. Structurally, the water vascular system consists of a series of fluid-filled canals lined with ciliated epithelium and connected to numerous tube feet. The system opens to the exterior through a porous structure called the madreporite, usually located on the aboral surface. Seawater enters the system through the madreporite, which also functions as a sieve to filter debris and __________ _______ _______ ______ ___ ______ ___ ________ ___ ____.
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