Filtering water for its food content is common in aquatic organisms, including at least some members of the Porifera, Cnidaria, Mollusca, and Annelida.

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These phyla include organisms that filter water to extract their food, such as sponges (Porifera), jellyfish (Cnidaria), various bivalves like clams and oysters (Mollusca), and some polychaete worms (Annelida). This feeding strategy is known as filter feeding and is widespread among aquatic organisms.

Filtering Water for Its Food Content Is Common in Aquatic