Across
- 4. tooth-like scales found in sharks and rays.
- 9. a gas-filled organ that helps bony fish maintain buoyancy.
- 11. a flexible rod-shaped structure that provides skeletal support in chordate embryos
- 12. bony fish with fins supported by bony rays.
- 14. bony fish with fleshy, lobed fins.
- 16. a fin on the back of a fish, used for stability.
- 17. a cartilaginous fish with a flattened body and wing-like fins.
- 19. a small, eel-like marine animal with chordate characteristics.
- 20. the tail fin of a fish, used for propulsion.
Down
- 1. a jawless fish with a sucking mouth.
- 2. a marine invertebrate with a sac-like body that filter-feeds.
- 3. a bony flap that covers and protects the gills of bony fish.
- 5. animals that rely on external heat to regulate body temperature.
- 6. a cartilaginous fish with a flattened body and wing-like fins.
- 7. a sensory system in fish that detects vibrations and pressure changes.
- 8. a heart chamber that pumps blood out of the heart
- 10. a heart chamber that receives blood.
- 13. a jawless marine fish that produces slime.
- 15. a common cavity for the digestive, urinary, and reproductive systems.
- 18. paired fins on the sides of a fish, used for steering.