Across
- 2. descent with modification
- 8. layers of rocks
- 9. the study of formation growth and development
- 11. the wings of a bird
- 12. change
- 13. Deoxyribonucleic acid
- 14. the biological mechanism by which organisms adjust
- 15. a feature that a species inherited from ancestor
Down
- 1. the process which organisms adapt
- 3. the preserved remains of plants and animals
- 4. the act or fact of living
- 5. basic unit of hereditary passed from one parent to a child
- 6. similar structures from a different ancestor
- 7. the smallest particle of a substance
- 10. placing events in order