Across
- 2. how much an animal helps their populations survival.
- 3. longer existing life form.
- 6. a drug for when you are sick.
- 10. generation to generation change to gain a competitive edge.
- 11. record chronological collection of remains.
- 12. structure similar structures in descendants.
Down
- 1. the interbreding of populations.
- 4. the smallest change in a population possible.
- 5. passed on traits.
- 7. pool genetics still being passed on.
- 8. how many live in one area.
- 9. preserved remains.