Marine sponge

Marine sponge

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Credit: ALEXIS ROSENFELD/SCIENCE PHOTO LIBRARY

Caption: Marine sponge (Crella sp.). Sponges are very primitive multicellular animals. Sponge fossils have been found in rock 600 million years old. They are sessile (immobile), growing attached to solid objects on the sea bed. Sponges feed by pumping water through pores in their tough outer skin, and filtering out any plankton (microscopic organisms). The water is then pumped out of the sponge's larger holes. Photographed in the Red Sea, Marsa Alam, Egypt.

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Keywords: africa, animal, aquatic, benthic, biological, biology, bottom dwelling, crella sp., egypt, fauna, filter feeder, hermaphrodite, immobile, invertebrate, invertebrates, marine, marine biology, marsa alam, multicellular, nature, ocean, pore, pores, primitive, red sea, sea bed, sessile, sponge, underwater, wildlife, zoological, zoology

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