Across
- 2. animals who need the environment to regulate their temperature
- 5. muscles you can control
- 7. a huge collection of dust, gases, and billions of stars
- 9. animals that have a spine
- 10. a group of visible stars that form a pattern
- 11. the protection of things found in nature
- 13. a living thing
Down
- 1. muscles you cannot control
- 3. animals that do not have a spine
- 4. the sun and all the objects that orbit around it
- 6. the path an object takes around another
- 8. animals who can make their own heat
- 12. the study of space