Across
- 3. geographic distribution of a species
- 4. structures with little or no use
- 7. study of fossils
- 8. characteristics in related species can have underlying similarity even though functions may differ
- 9. similar anatomy from common ancestors
- 10. similar structures, function in similar environments
Down
- 1. A fossil that shows an intermediate state between an ancestral trait and that of its later descendants
- 2. similar DNA and amino acid sequences
- 5. remains or traces of organisms from past
- 6. change in species over time.