Across
- 3. having to do with the relationship of living things to each other and to the world around them
- 5. very wet areas, such as swamps or marshes
- 7. invaded by a large number of harmful animals or insects
- 8. animals that hunt other animals for food
Down
- 1. killed or destroyed in large numbers
- 2. a passage built across land and filled with water so ships can cross
- 4. species plants or animals that spread into new areas and harm the living things that are already there
- 6. changed over time for a new purpose