biology fish and amphibians 1

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Across
  1. 4. a skin like protective layer around the bone
  2. 5. - (cold blooded) cannot heat their body
  3. 10. is a young frog or toad
  4. 11. living cells of the bone.
  5. 13. - Vertebrates that breathe water when young and air when adult.
  6. 16. vessels going from the heart to the body
  7. 18. Skeleton - Skull and body
  8. 20. Skeleton -arms & legs
  9. 22. Cells that build bone
  10. 23. Small vessels that connect arteries & veins allow food, water and oxygen to exit the blood.
  11. 25. Animals Containing a backbone
  12. 26. Soft tissue in the bone that makes blood.
  13. 28. system- blood is contained in Vessels.
  14. 29. organisms a notochord during its whole life (lancet-small fishlike organism)
Down
  1. 1. a skeleton inside built of bone & Cartilage
  2. 2. covering gills (allows breathing when still.
  3. 3. bone tissue (usually found at the ends) With lots of holes & tunnels containing marrow.
  4. 6. fully formed bone matrix cells
  5. 7. recieves blood from the body
  6. 8. Smooth flexible layer at the ends of bones inside of joints
  7. 9. a structure similar to a backbone made entirely of I length of cartilage
  8. 12. Cells that break down bone releasing calcium
  9. 14. vessels going from the body back to the he art
  10. 15. line of cartilage where growing owbone's lengthen
  11. 16. absorb oxygen through skin
  12. 17. pumps blood out of the heart
  13. 19. small structures of bone and Cartilage surrounding the nerve chord.
  14. 21. bone matrix with few holes and I large tunnel containing marrow
  15. 24. Organisms with a notochord during development but not as (sea squirt) an adult
  16. 27. fin - tail. Pushes fish forward
  17. 30. a state of low metabolism & respiration in cold temperatures