Science words

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Across
  1. 3. Mammals, Reptiles, Arachnids
  2. 5. a massive, luminous sphere of plasma—primarily hydrogen and helium
  3. 6. The basic structural and functional unit of all living organisms
  4. 7. A pure substance consisting only of atoms with the same atomic number
  5. 10. Force that opposes motion between two touching surfaces
  6. 12. Force that pulls objects toward the center of the Earth
  7. 13. the scientific study of Earth
  8. 16. Natural selection and adaptation
  9. 17. Inheritance and DNA terms
  10. 18. A biological community of interacting organisms and their physical environment
Down
  1. 1. Molecule carrying genetic information in most organisms
  2. 2. Solids, Liquids, Gases
  3. 4. Early human history/fossils
  4. 8. Earth's moving plates.
  5. 9. Evaporation, condensation, rain
  6. 11. The envelope of gases surrounding the earth or another planet
  7. 14. a push or pull acting upon an object resulting from its interaction with another object
  8. 15. Smallest particle of an element, consisting of protons, neutrons, and electrons