Across
- 2. Important parts or characteristics of something.
- 5. To change and develop over a long period of time.
- 6. The ability to move through the air.
- 8. A change that helps a living thing survive or do something better.
- 10. Pulled to become longer or wider.
- 12. To fly high in the air without much effort.
Down
- 1. The ability or power to do something.
- 3. The soft covering on a bird's body and wings.
- 4. To move smoothly through the air without flapping wings.
- 6. To move wings up and down to fly.
- 7. Happening after something else; the last to appear.
- 9. How heavy a person, animal, or object is.
- 11. Happening first in time.