Adaptation of dolphins crossword puzzle

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Across
  1. 2. for insulation in cold water
  2. 3. body shape for efficient movement
  3. 7. sensory system in some fish
  4. 11. bladder for buoyancy control
  5. 12. teeth for catching prey
  6. 15. aids in floating
  7. 16. beaks for catching fish
  8. 18. for swimming
  9. 19. for underwater breathing
Down
  1. 1. bodies to navigate tight spaces
  2. 4. anchor aquatic plants
  3. 5. feet for propulsion
  4. 6. outer skin for protection bioluminescence for attracting prey
  5. 8. to hide from predators
  6. 9. for grasping prey
  7. 10. sacs in aquatic plants for buoyancy
  8. 13. process in aquatic plants
  9. 14. camouflage technique
  10. 17. line system for sensing vibrations