Invertebrates

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Across
  1. 6. number of legs an arachnid has
  2. 9. simplest of all animals
  3. 11. animals that don't have a backbone
  4. 12. tapeworms fit in this phylum of animals
  5. 14. phylum that contains earthworms and leaches
  6. 16. class that contains octopus and squid
  7. 18. smartest invertebrate
Down
  1. 1. body parts arranged like spokes on a wheel
  2. 2. first animals to fly
  3. 3. number of body segments an insect has
  4. 4. stinging cells in cnidarians
  5. 5. phylum that has an exoskeleton
  6. 6. external skeleton
  7. 7. hookworms are an example of this group of animals
  8. 8. classification level after class
  9. 10. animal that live and feed on or in another animal
  10. 13. group of animals with stinging tentacles
  11. 15. type of metamorphosis that a butterfly undergoes
  12. 17. phylum that contains snails, octopus, and clams