Matter and its interactions

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Across
  1. 2. A property that can be observed with the five senses
  2. 4. X-shaped structure that holds DNA
  3. 6. Having two different genes
  4. 8. the scientific name for children
  5. 10. Two elements combined chemically
  6. 12. the amount of mass per volume
  7. 13. Smallest particle of something
  8. 14. remains of a long dead organism found in the ground
  9. 16. When something is being made or controls by humans
  10. 19. The theory that species have changed over time
  11. 20. A trait that helps an organism survive
  12. 21. A gene that is more powerful and shows
Down
  1. 1. negatively charged particle
  2. 2. The square used to predict genetics
  3. 3. Neutrally charged particle
  4. 5. positively charged particle
  5. 6. Having two of the same genes
  6. 7. A gene that is weaker and does not show
  7. 9. A property that can only be observed during a chemical reaction
  8. 11. the simplest form of a pure substances
  9. 15. Different forms of something
  10. 17. a push or a pull on an object
  11. 18. a substance with a density of less than 1g/ml will__________.