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The three major groups of mollusks are gastropods, bivalves, and cephalopods.

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What is the structure of roundworms digestive system?

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What is the structure of roundworms digestive system?

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Unlike cnidarians or flatworms, roundworms have a digestive system that is like a tube, open at both ends.

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Flat worms are flat and soft as jelly.

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What are the main characteristics of worms?

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What are the main characteristics of worms?

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All worms are invertebrates and that have long, narrow bodies without legs.

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1. A flexible organ with tiny teeth

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2. Animals such as snails and slugs

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3. Organs that remove oxygen from water.

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6. A system where blood is not inside blood vessels

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5. Are invertebrates with soft, unsegmented bodies.

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4. A system where blood moves within a connected network of tubes

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7. A tube where organism waste exits

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8.  A food source for another organism

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10. Is an organism that lives inside of another organism.

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9. A knot in the nerve tissue in the head end