Across
- 2. to keep an animal
- 5. when you realize there's nothing you can do
- 7. to using something else
- 8. part of a cell
- 9. looks exactly the same
Down
- 1. the person who understands you the best
- 3. research that studies how traits are passed on
- 4. a dog or cat without a home
- 6. making an exact copy