Marine Science Chapter 8

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Across
  1. 2. - inner cell layer of worms
  2. 5. - planarians don't have a respiratory system or a
  3. 6. - type of symmetry in worms
  4. 8. - worms that live in giant tubes near deep sea vents
  5. 10. - outer cell layer of worms
  6. 14. - body characteristic found in annelids
  7. 16. - worms that attach to a host and suck their blood
  8. 17. - most numerous worms in ocean
  9. 18. - worms with visible blood
  10. 21. - live in hard tubes, also called fan worms
  11. 23. - either extremely small or missing in worms
  12. 24. - anticoagulant leeches use
  13. 25. - nerve cell clusters that act like a brain
Down
  1. 1. - middle cell layer of worms
  2. 3. - tapeworms lack this body system
  3. 4. - live in u-shaped, parchment-like tubes
  4. 7. - largest free-living worms in ocean
  5. 9. - use mouth bristles like hooks to feed
  6. 11. - phylum name that means "bristle jaw"
  7. 12. - extension that acts like a spear in some worms
  8. 13. - phylum name that means "many bristles"
  9. 15. - trematodes are also called
  10. 19. - paddle-like appendages found in sandworms
  11. 20. - must live on or in an alive host to survive
  12. 22. - flatworms with amazing regeneration