Across
- 2. changes to the natural world that can be caused by nature and/or humans
- 3. the presence of dirty and unsafe things in the land, water, or air
- 6. a thing that is not reusable
- 8. something an organism does to survive in its environment
- 11. physical structures that help an organism survive in its environment
Down
- 1. things that makes the land, water, or air dirty and unsafe
- 4. giving another living thing information
- 5. when an animal moves a long distance on a seasonal basis
- 7. living things working together for something that benefits all of them
- 9. a group of living things that live and work together
- 10. a group of related individuals that resemble one another