Jawless Fish Crossword Puzzle

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Across
  1. 2. (live on ocean but travel to freshwater)
  2. 3. a species introduced into a new environment which is harmful towards it
  3. 5. the class of lampreys
  4. 7. animals that only live in the ocean live in?
  5. 9. The infraphylum of jawless fish
  6. 12. a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.
  7. 13. the class of hag fish
  8. 14. animals whom have a backbone
  9. 15. a type of jawless fish which starts off in saltwater but eventually moves to freshwater areas.
  10. 17. reproduction, the reproduction of which consists of a male and female partner
  11. 19. animals who do not have scales
  12. 21. consisting of no bones
Down
  1. 1. an organism that drains nutrients from other animals in order to sustain its own.
  2. 4. Animals that have no jaw are?
  3. 6. animals that consume dead organisms
  4. 8. a type of jawless fish which only lives in saltwater.
  5. 10. chambered heart, the type of heart which a boneless fish has
  6. 11. an animal of the large phylum Chordata, comprising the vertebrates together with the sea squirts and lancelets.
  7. 16. a defense mechanism that jawless fish excrete to clog the gills of its predators
  8. 18. gill pouch, an organ pertaining to jawless fish
  9. 20. eye, a type of eye which jawless fish contain