Echinoderms possess a sieve-like plate that allows water to enter the water vascular system. This plate is called the:
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Correct answer: Madreporite
The madreporite is a calcareous, sieve-like plate on the aboral surface of echinoderms. It acts as a pressure-equalizing valve and filters the intake of seawater into the stone canal, maintaining hydrostatic pressure within the water vascular system.
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