Across
- 3. All the parts of Earth where living things exist.
- 4. A medicine that kills certain bacteria or stops them from growing.
- 5. A close relationship between two different living things that live or work together.
- 8. The order in which events happened over time.
- 9. Able to break down naturally without causing long-lasting harm to the environment.
- 10. Something involving biological material that could be harmful to people or the environment.
Down
- 1. The act of making things happen or work together at the same time.
- 2. Arranged in the order that events happened, from earliest to latest.
- 6. Related to living things or life.
- 7. Describing a close relationship between two different living things that live or work together.