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Aquatic, sessile invertebrates that have no true tissues or organs that make up the phylum Porifera.
Describes an organism that remains attached to a surface for its entire life and does not move.
Collar cells; Flagellate cells that line the cavities of a sponge and draw water into the sponge by beating their flagella.
Tiny, hard particles of calcium carbonate or silicon dioxide that are often shaped like spikes; what some sponge skeletons are made of.
A method of feeding in which an aquatic animal traps organic material that is floating in the surrounding water; how sponges feed.
Cells which crawl about within the body wall of a sponge that distribute nutrients throughout the body.
Asexually produced internal buds that some freshwater sponges create during poor conditions. Food-filled balls of amoebocytes surrounded by a protective coat made of organic material and spicules that can survive harsh conditions.
The hollow gut in the center of the body of a cnidarian which has a single opening, or mouth.
A sensory structure at one end of a ctenophore's body that enables ctenophores to sense their orientation in the water.
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