Across
- 4. living organisms that perform photosynthesis and provide oxygen, food, and other resources
- 6. live in water and breathe through gills
- 9. lives on land and in water
- 11. the study of weather
- 12. the study of all extraterrestrial objects and phenomena
- 13. how oxygen is created, used by other organisms and then feeds the original organism to start over
- 14. a process where one or more substances are transformed into a new substance with different properties
Down
- 1. warm-blooded creature that has feathers, beaks, and wings.
- 2. requires external source of heat
- 3. organisms that do not have a backbone
- 5. preserved remains from once living things
- 7. how water evaporates and condenses
- 8. the study of rocks and rock layers
- 10. alterations that affect the form or appearance of a substance