AP Biology Review

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Across
  1. 2. electrons are shared
  2. 4. a reproductive process that involves two parents
  3. 6. basic unit of matter
  4. 8. above 7 on the pH scale
  5. 9. negatively charged particle
  6. 10. a small particle in the nucleus with no charge
  7. 11. maintains a stable internal environment
  8. 12. the study of life
  9. 13. a pure substance made up of only one kind of atom
  10. 14. organized way of gathering and analyzing evidence about the natural world
  11. 17. electrons are transferred
  12. 19. below 7 on the pH scale
  13. 20. positively charged particle
  14. 21. attraction between molecules of the same substance
Down
  1. 1. the variable that is manipulated
  2. 3. a reproductive process that involves only one parent
  3. 5. a substance made up of two or more elements chemically combined
  4. 7. living planet
  5. 15. carbon, hydrogen, and oxygen in a ration of 1:2:1
  6. 16. attraction between molecules of different substances
  7. 18. a charged atom