Across
- 2. an organism's complete role in an ecosystem
- 3. the highness or lowness of a sound
- 4. the number of vibrations that occur during a unit of time
- 6. sound or series of sounds caused by the reflection of sound waves off a surface
- 8. the loudness or softness of a sound
- 10. to cause something to pass on from one object to another
- 11. everything that exists
- 12. a group of billions of stars and things that orbit them
Down
- 1. a meteoroid that hits the Earth's surface
- 5. a relationship in which one organism benefits and the other is unaffected
- 7. a disturbance that transmits energy
- 9. the place an organism lives in an ecosystem