Fish Crossword

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Across
  1. 4. This helps bony fish maintain buoyancy
  2. 6. Diamond shaped scales
  3. 7. These creatures look like rays except they have a dorsal fin on their tails
  4. 9. Some chondrichthyes lay eggs with a thick leathery protection over top
  5. 10. Smooth circular scales on bony fish
  6. 12. This class of creatures do not possess a true jaw
Down
  1. 1. This creature has a modified swim bladder that acts as a lung
  2. 2. Skeletal structures of creatures found in class Chondrichthyes
  3. 3. These type of fish have two rows of teeth
  4. 4. Circulatory system that all fish have
  5. 5. Part of the brain that helps interpret smell
  6. 8. Chondrichthyes use this organ to maintain buoyancy
  7. 11. Anatomical position for the back