Across
- 3. An organism that feeds on a living host
- 5. An organism that is killed and eaten by another organism
- 7. cycle The continuous process by which water moves from Earth's surface to the atmosphere and back
- 9. An interaction in which one organism kills another for food.
- 13. working together toward a common goal
- 14. water that fills the cracks and spaces in underground soil and rock layers
- 19. Conversion of nitrates into nitrogen gas
- 20. Evaporation of water from plants
- 21. A relationship in which both species benefit
- 24. to live together without any problems; to be together in the same time or space
Down
- 1. cycle The organic circulation of carbon from the atmosphere into organisms and back again
- 2. A common demand by two or more organisms upon a limited supply of a resource; for example, food, water, light, space, mates, nesting sites.
- 4. The change of a substance from a liquid to a gas
- 6. cycle The transfer of nitrogen from the atmosphere to the soil, to living organisms, and back to the atmosphere
- 8. water that flows over the ground surface rather than soaking into the ground
- 10. A chemical reaction that breaks down compounds into simpler products.
- 11. snow, sleet, or hail
- 12. Any form of water that falls from clouds and reaches Earth's surface.
- 15. The change from a gas to a liquid
- 16. A relationship between two organisms in which one organism benefits and the other is unaffected
- 17. A relationship in which one organism lives on or in a host and harms it.
- 18. An animal that naturally preys on others
- 22. A close relationship between two species that benefits at least one of the species.
- 23. An organism on which a parasite lives.