Across
- 2. to use something again
- 5. when there are only a few of one kind of organism
- 8. all the members of one kind of organism
- 9. to die out and life no more
Down
- 1. turn old things into new things
- 3. harmful materials get into the air land or water
- 4. something that helps an organism survive
- 5. all the living and nonliving thins surrounding an organism
- 6. to use less of something
- 7. the lack of rain for a long time