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Flatworms

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Flatworm
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  End Show Slide 1 of 41 Copyright Pearson Prentice Hall Biology  End Show Slide 2 of 41 Copyright Pearson Prentice Hall 27  – 1 Flatworms  End Show 27  – 1 Flatworms Slide 3 of 41 Copyright Pearson Prentice Hall What Is a Flatworm? What Is a Flatworm? Flatworms are soft, flattened worms that have tissues and internal organ systems. They are the simplest animals to have three embryonic germ layers, bilateral symmetry, and cephalization.  End Show 27  – 1 Flatworms Slide 4 of 41 Copyright Pearson Prentice Hall Form and Function in Flatworms Feeding Flatworms have a digestive cavity with a single opening through which both food and wastes pass. Near the mouth is a muscular tube called a pharynx . Flatworms extend the pharynx out of the mouth. The pharynx then pumps food into the digestive cavity.
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