Across
- 5. The introduction of a harmful substance into the environment
- 6. A genetically determined characteristic
- 7. Related to or involving living things
- 8. Relying on someone or something else
Down
- 1. A period where there is little or no rain
- 2. Physical rather than biological; non-living
- 3. All inhabitants of a particular area
- 4. A large quantity of something
- 9. A biological community of interacting organisms