Across
- 3. The natural world, the place we live
- 5. Any scientific test that is done on a live animal
- 7. Turning materials from one thing into something new
Down
- 1. When something harmful is added to the environment
- 2. The belief that non-human animals have natural rights
- 4. Things that are designed to be used more than once
- 6. The gradual rising of Earth's temperature