Across
- 2. function of the swim bladder for most fish
- 4. gill covering of holocephalians and bony fish
- 9. lobe-finned bony fishes
- 10. hagfishes, very slimy
- 11. jawless fishes
- 12. sharks, skates, rays, chimera
- 13. sharks but not holocephalians
- 16. _______-exchange maximizes gas exchange in fish
- 17. lampreys to scientists
- 18. fish respiratory structures
- 19. clade of fish with four legs
Down
- 1. ______-line system senses vibrations in water
- 3. lays eggs that hatch internally
- 5. scale type of a shark
- 6. craniate infraphylum excluding hagfishes
- 7. animals with live birth
- 8. jawed fishes
- 12. chordate clade of fish, frogs, snakes, mice
- 14. egg-laying animals
- 15. ray-finned bony fishes