Across
- 4. that helps an
- 5. are known as
- 8. rocks are found at the
- 9. law of superposition
- 13. imprints of once-living
- 16. to breed to get the
- 18. and reproduce
- 19. structures.
- 20. most adapted to
- 21. /an adaptation is a
- 22. are found at the top and
- 23. /attempted to explain how
Down
- 1. environment will
- 2. Remnants of once-useful
- 3. choose which
- 6. they want
- 7. are solidified remains
- 10. in its environment.
- 11. solidified remains or imprints of once-living organisms.
- 12. survive and
- 14. occurs
- 15. rock, younger
- 17. that in layers of