Across
- 4. active during the day
- 5. nonliving components in an ecosystem
- 6. an organism that is not native to a habitat
- 8. raw materials sourced from nature
- 10. at risk of becoming extinct
- 11. the variety of life on earth
- 12. moving to a new area
- 13. using resources wisely
Down
- 1. too many animals in a population
- 2. protecting ecosystems
- 3. living components in an ecosystem
- 7. all the living and nonliving things in an area
- 8. active at night
- 9. a period of nonactivity