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Flatworms and Roundworms

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Across

2. Number of cell or germ layers in worms

5. Parasitic flatworms

7. Reproductive sections of a tapeworm’s body

10. Process used by flatworms to exchange gases with the environment

13. Outermost cell layer in flatworms

15. Protective layer covering the outside of roundworms

16. Tubular structures in flatworms that can be extended to feed

19. head with hooks and suckers on tapeworms

20. Parasitic roundworm in the tropics that infects and swells the lymphatic system

24. Free-living flatworm found in moist places

25. Location of most of the sensory organs at the head end of the flatworm

26. Parasitic roundworm that live in the intestines of pigs and horses

27. clusters of nerve cells at the anterior end of a flatworm that function as a simple brain

28. Long, slender worms whose body tapers at both ends

29. Thick outer layer protecting flukes from the host’s immune system

30. Simplest animal withy bilateral symmetry

31. Phylum for flatworms

Down

1. Structures in flatworms that excrete excess water and wastes

3. Parasitic roundworm with hooked plates found in its host’s intestines

4. Two light sensitive structures on the head of flatworms

6. Innermost cell layer in worms

8. Ability of flatworms to asexually divide into pieces and reform new planarians

9. Cavity in flatworms where digestion occurs

11. number of openings to the flatworm gut

12. Middle cell layer in worms

14. Most common parasitic roundworm in the U.S.

17. Two hosts of the blood fluke

18. Parasitic flatworm lacking a digestive system

21. Solid body plan of flatworms

22. disease caused by eating poorly cooked, infected pork

23. Dormant tapeworm larva that live in the muscles of its host

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