No Backbone! Vocabulary

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Across
  1. 4. structure such as legs and antennae
  2. 7. animal with endoskeleton and a backbone
  3. 13. Fertilization when the sperm and egg combine inside the animals body
  4. 14. middle body region of the insect
  5. 16. used for biting and chewing by insects
  6. 17. a disease from eating raw meat
  7. 18. animals without backbones
  8. 19. small pinchers that aid in catching food
  9. 20. animals belonging to the phylum chordata
  10. 21. opening to the water vascular system
Down
  1. 1. hard or tough outer coverings for support
  2. 2. piece in which legs and wings are attached on a insect
  3. 3. produce both eggs and sperm in one animal's body
  4. 5. internal skeletons
  5. 6. a group of nerve cell bodies that coordinates incoming and outgoing nerve singles
  6. 8. possess of shedding an exoskeleton
  7. 9. a knob-shaped structure with hooks and suckers
  8. 10. the muscluler sac
  9. 11. individual sections behind the scolex
  10. 12. system of branching tubes
  11. 15. a possess in which a body part regrows
  12. 19. tubelike muscular organ