ch 13

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Across
  1. 2. stuck in 1 place
  2. 5. digestive track
  3. 6. body cavity that contains internal organs
  4. 10. body form that swims
  5. 12. body form that attaches to surface
  6. 13. egg, larva, pupa, adult
  7. 15. heart pumps blood through vessels
Down
  1. 1. blood is not in vessels
  2. 3. skeleton of small hard fibers
  3. 4. egg, nymph, adult
  4. 7. mass of nerve cells
  5. 8. no definite shape
  6. 9. nerve cells
  7. 11. body organized around center
  8. 14. 2 nearly identical halves