Across
- 5. too many of one kind of living thing
- 9. no longer alive on Earth
- 10. the living things in an environment
- 11. an organisms home
Down
- 1. a group of the same type of organism
- 2. a long period of time with little precipitation
- 3. any evidence of an organism that lived in the past
- 4. the living part of an ecosystem
- 6. the living and nonliving things in an environment
- 7. harmful substances in the Earth's air, water, or land
- 8. the nonliving things in an environment