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