Across
- 1. make their own food
- 4. place where an organism lives and interacts
- 5. puts nutrients in to the soil
- 7. succession gradual changes to an environment
- 8. essential to the survival of other living things
- 11. populations living in one place
Down
- 1. all living individuals of a species in an area
- 2. what a species needs to stay alive such as air, water
- 3. the saving of the earth's resources
- 6. dangerous levels of substances that harm the environment
- 7. energy flows through this in one direction
- 9. must go out and find its food
- 10. pollution causes the depletion of this layer