Across
- 5. Fourth state of matter.
- 7. Molecule that carries genetic information.
- 9. Nerve cell.
- 10. Force that attracts objects toward the Earth.
- 11. Smallest discrete quantity in physics.
- 14. Path of a celestial body around another body.
- 15. Basic unit of life.
Down
- 1. Infectious agent that replicates inside living cells.
- 2. Particle of light.
- 3. Anything that has mass and takes up space.
- 4. Ability to do work.
- 6. Smallest unit of matter.
- 8. Nuclear reaction combining atomic nuclei.
- 12. Substance with a pH less than 7.
- 13. Push or pull on an object.