Science

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