Across
- 3. a part of bird's stomach that has thick muscles
- 4. to push or move something somewhere
- 8. relating to behaviour
- 10. the only person or thing in a place:
- 13. helps in controlling the loss or gain of heat of an organism
Down
- 1. reflecting a gentle light that seems to move slightly
- 2. relating to the structure of something
- 5. relating to how the bodies of living things work
- 6. extremely big
- 7. the process by which your body digests food
- 9. being the only existing one of its type
- 11. the evolutionary process whereby an organism becomes better able to live in its habitat or habitats
- 12. very dry