Vertebrates

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Across
  1. 1. Animals whose young develop inside the mother's body.
  2. 4. Body covering that helps insulate mammals.
  3. 5. Line A sensory organ in fish that detects movements in the water.
  4. 8. Limbs adapted for swimming in fish.
  5. 9. Vertebrates with waterproof scales and lungs for breathing.
  6. 10. The process by which a tadpole transforms into an adult amphibian.
  7. 12. The body covering characteristic of fish and reptiles.
  8. 16. Animals whose eggs remain inside the body until they hatch.
  9. 18. Animals that can maintain a stable internal body temperature.
  10. 19. Animals that reproduce by laying eggs.
Down
  1. 2. Animals that have a backbone and an internal skeleton.
  2. 3. A group of vertebrates that feed their young with milk.
  3. 6. Animals whose body temperature depends on the environment.
  4. 7. Vertebrates with feathers, wings, and a beak.
  5. 8. Aquatic vertebrates that move using fins.
  6. 11. A structure that protects the gills of bony fish.
  7. 13. Respiratory organs that extract oxygen from water.
  8. 14. Organs used by many vertebrates to breathe air.
  9. 15. Structures that cover the bodies of birds.
  10. 17. Animals that live part of their lives in water and part on land.