Across
- 4. Animals that have the same temperature as their environment.
- 8. Animals with moist skin and lay soft eggs.
- 9. Animals that make their own body heat.
- 11. Cold-blooded animals that lay eggs and live in water.
- 12. Plants with tubes that carry water and nutrients.
- 14. Animals without backbones.
- 16. Ancient animal bones that have turned to stone.
- 17. Animals with backbones.
Down
- 1. These organisms are multicellular and eat other organisms.
- 2. Scientists sorted every organism into these six groups.
- 3. Animals with spinal cords.
- 5. A protective outer covering.
- 6. Animals that have fur and produce milk.
- 7. Warm-blooded animals with feathers.
- 10. Mammals that lay eggs.
- 13. The process of grouping organisms based on their similarities.
- 15. Animals that are cold-blooded and have tough, dry skin.