Across
- 3. The study of heredity
- 6. Speed in a certain direction
- 7. The transfer of heat through direct contact
- 8. A push or pull on an object
- 10. The force that pulls objects toward Earth
- 12. A force that slows motion between two surfaces rubbing together
- 13. The organelles that release energy from food
- 14. A tool used to measure air pressure
- 15. The basic unit of life
- 18. The body system responsible for breathing
- 20. The molecule that carries genetic information
Down
- 1. The layer of gases surrounding Earth
- 2. Energy of motion
- 4. The control center of a cell
- 5. The process of water vapor cooling into liquid droplets
- 9. A trait that masks another trait
- 11. A chart used to predict genetic outcomes
- 16. A violently rotating column of air touching the ground
- 17. A group of organs working together
- 19. Water that falls from clouds to Earth as rain, snow, sleet, or hail