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Chapter 6 Section 2
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Fun Fact: For a long time, scientists thought sponges were plants, not animals. Adult sponges are sessile- remain attached to one place
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Most sponges live in oceans, but some live in freshwater. Filter food out of water that flows through body Microscopic organisms and oxygen are carried into central cavity through pores of sponge Flagella keep water moving though sponge
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Soft bodies supported by sharp, glasslike structures called spicules Some have material called spongin- similar to foam rubber, making bodies elastic and soft Some have both.
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Have tentacles surrounding mouth (ex. Jellyfish, coral, sea anemones) Tentacles shoot out stinging cells, called, nematocysts, to catch prey Have radial symmetry, can locate food that floats by from any direction
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2 different body forms ◦ Vase-shaped called polyp ◦ bell-shaped body called medusa
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Search for food Invertebrates with long, flattened bodies Bilateral symmetry Soft bodies with 3 layers of tissue Plnaraians- free-living flatworms with digestive system with one opening Parasites- live in or on their hosts
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Most widespread animal on Earth Body like a tube within a tube, with a fluid-filled cavity between two tubes Digestive tract has two openings Some are decomposers, some predators
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Pick one question and answer in a complete sentence. Why would spongin and spicules discourage predators from eating sponges? What are three characteristics of flatworms and roundworms.
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