Across
- 4. different air masses neither replacing the other
- 7. constriction of a chromosome
- 9. friction between a rolling object and a surface
- 13. XY karyotype
- 14. objects more through a fluid or gas
- 16. two surfaces sliding past each other
- 18. A Double Helix
Down
- 1. warmer mass of air replacing cold mass of air
- 2. one copy of genetic info in a single chromosome
- 3. Decreases speed in a chemical reaction
- 5. colder mass of air replacing warmer
- 6. two surface in contact and not moving
- 8. XX karyotype
- 10. increases speed in a chemical reaction
- 11. a change in DNA sequence
- 12. mass*acceleration
- 15. Ability to reproduce offspring within an environment
- 17. moving objects keep moving