Across
- 7. is best suited for their environment survive and reproduce
- 9. changes over time
- 10. individual's ability to reproduce and survive
- 11. formation of new species
Down
- 1. number and relative abundance of various species
- 2. evolutionary history of a species
- 3. body parts that have different mature forms
- 4. differences in characteristics among individual species
- 5. of any inherited trait makes an organism
- 6. physically similar structures
- 8. homologous organs that are no longer used