Across
- 3. make more offspring
- 5. events happen by chance
- 7. mechanism by which evolution occurs
- 9. average trait is common
- 10. population decrease due to moving
Down
- 1. help an organism survive and reproduce
- 2. population size decrease due to a catastrophe
- 4. determined by the environment
- 6. father of evolution
- 8. no longer mate and make fertile offspring