Across
- 3. A chemical reaction where energy is released
- 5. All of the water found on Earth
- 7. A layer of Earth’s atmosphere above the troposphere containing the ozone layer
- 8. A symbiotic relationship where both organisms benefit
- 9. A biological community of interacting organisms and their physical environment
- 10. An animal that hunts other animals as its source of food
Down
- 1. The mixture of gases above the surface of Earth
- 2. A substance that can be added to a chemical reaction to increase the reaction rate
- 3. A chemical reaction where energy is absorbed
- 4. A symbiotic relationship where a parasite benefits from living on or in a host
- 6. How fast the reaction goes