Across
- 7. _________ factors are nonliving things in an ecosystem
- 8. animals that are hunted
- 9. model showing the amount of energy available in each step of a food chain
- 11. process using chemical energy in matter to make food
- 12. layer of gases surrounding Earth
- 14. average weather conditions in an area over time
- 15. living and nonliving things in a given area
- 16. unicellular organisms without a membrane-bound nucleus
- 17. organisms that do not need to eat other organisms to obtain energy
- 18. process during which water vapor changes into liquid water
- 20. water that falls from clouds to Earth’s surface
- 21. process during which liquid water changes into water vapor
Down
- 1. __________ factors are living things in an ecosystem
- 2. series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen
- 3. multi path model of energy transfer showing how the food chains in a community are interconnected
- 4. organisms that must eat other organisms for energy
- 5. animals that hunt other animals
- 6. single path model showing how energy flows in an ecosystem
- 10. to set free
- 13. cannot be separated by chemical means
- 19. process that changes atmospheric nitrogen into compounds usable by living things