Arthropods

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Across
  1. 6. how arthropods grow
  2. 7. used to obtain oxygen from the air
  3. 8. millipedes
  4. 11. where the first arthropods lived
  5. 12. how arthropods reproduce
  6. 15. protecting part of invertebrate, has a distinct appearance and function
  7. 17. skeleton outside body
  8. 19. single nerve impulse results in many cycles of wing flaps
  9. 20. eats decomposing material
Down
  1. 1. type of circulatory system
  2. 2. what the exoskeleton is made of
  3. 3. mobile mouth parts
  4. 4. centipedes
  5. 5. middle area of an insects body
  6. 6. immobile mouth parts
  7. 9. the type of symmetry arthropods have
  8. 10. used for touch and tasting
  9. 13. used to obtain oxygen from the water
  10. 14. combination of the head and thorax
  11. 16. posterior division of the body of an arthropod
  12. 18. used in reproduction behaviors of both sexes