Fish

1234567891011121314
Across
  1. 3. finger like projections where are exchanged
  2. 8. 2nd heart chamber (pumps blood to gills to pick up oxygen)
  3. 9. strong, flexible tissue
  4. 10. hard plate that covers/protects and pumps water over gills
  5. 11. hard plate like structure on skin
  6. 12. tubelike units that regulate body's salt and water levels
  7. 13. cartilaginous jawless fishes
  8. 14. sensory system extending down bony fishes body
Down
  1. 1. type of blood circulation in fish
  2. 2. jawed fish w/ skeletons composed of bone
  3. 4. lone, fleshy fins supported by central core of bones
  4. 5. jawless fish
  5. 6. 1st chamber of fish heart (pumps to ventricle)
  6. 7. type of external fertilization most fish use
  7. 8. individual segments that make up backbone
  8. 11. gas filled sac in bony fish to maintain buoyancy