Across
- 1. the complex of a community and its environment functioning as an ecological unit in nature
- 2. amount of acid
- 7. someone who improves the environment
- 8. neither this, nor that
- 11. someone who makes, designs, and improves
- 12. costumer
Down
- 1. ask,design plan, create
- 2. someone or something that makes something
- 3. litter, oil spill, etc.
- 4. anything made to help humans
- 5. water underground
- 6. no acid
- 9. no base
- 10. the totality of interacting food chains in an ecological community