Across
- 1. An animal with a backbone.
- 4. A really cool NF teacher
- 8. An organ in fish that inflates and deflates.
- 10. Changing from a larva into an adult.
- 12. Includes octopus, squid and snails
- 14. Small, hard plates that cover the skin of fish.
- 17. An animal with NO backbone.
- 19. A hard outer structure that provides support and protection for the bodies of some animals.
- 20. Includes spiders, scorpions, ticks and mites.
- 21. Includes lampreys and hagfish.
Down
- 2. Includes sunfish, goldfish and most other shiny aquarium fish.
- 3. A special sense organ in fish that helps them detect movement in the water.
- 5. The organ that a fish uses to breathe
- 6. Includes sharks, rays and skates.
- 7. Long, thin sensory organs on the heads of some animals.
- 9. An internal support structure found in vertebrates.
- 11. When an animal is fully grown and can reproduce.
- 12. When an animal sheds its old skin to grow new one.
- 13. A small invertebrate with three body parts, six legs, and antennas.
- 15. The last part of an animal's body.
- 16. Includes crabs, lobsters, and shrimp.
- 18. The middle part of an animal's body.