Chordates and Fishes

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Across
  1. 2. a small elongated marine invertebrate that resembles a fish but lacks jaws and obvious sense organs.
  2. 7. a marine tunicate that has a body with orifices through which water flows into and out of a central pharynx.
  3. 8. Cold-blooded
  4. 10. an unpaired fin on the back of a fish or whale
  5. 11. Posterior/external opening where digestive,reproductive,urinary systems combine to excrete materials.
  6. 12. A parasite
  7. 14. Fleshy fins joined to body by a single bone
  8. 16. Tail fin
  9. 17. Helps fish breathe without swimming
  10. 18. The upper chamber of the heart
  11. 19. detects changes in sound, touch, pressure, or other distortions & vibrations in the water
  12. 20. helping to control the direction of movement during locomotion.
Down
  1. 1. large, growing to a maximum size of just over 2.5 m, and bulky.
  2. 3. Teeth-like scales that feel like sandpaper
  3. 4. This class consists of all the cartilaginous fishes
  4. 5. Slimefish
  5. 6. Lower chamber of the heart(main pumping chamber)
  6. 9. Helps with sinking or floating
  7. 13. a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
  8. 15. Fins are stretched over bony or spikey spines