Across
- 6. theory that explains how life on earth began
- 7. various structures in different species having the same function but have evolved separately
- 8. the process of selecting organisms with desired traits
- 10. the last shared common ancestor on the branching tree of evolution
- 13. Technique used to determine which fossils are older
- 14. theory that species evolve rapidly
- 15. comparison of early embryonic development reveals similarities which suggest common ancestry
Down
- 1. Bats and butterflies have the same function but evolved separately
- 2. bats, frogs, and lions all have similar bone structure
- 3. a wrong theory:inheritance of acquired characteristics
- 4. black butterflies die out first because they don't blend in well
- 5. the millions of fossils that scientists have collected
- 9. similarities in structure
- 11. the dinosaurs no longer exist because of this
- 12. the theory that evolution occurs slowly but steadily