natural selection,evolution, antivirals, and bacteria

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Across
  1. 4. discovered the idea of natural selection
  2. 7. have a nucleus and membrane-bound organelles
  3. 12. ancestor you and another organism share
  4. 13. no nucleus or membrane-bound organelles
  5. 14. survival of the fittest
  6. 15. changes in a species over time; evolving
Down
  1. 1. solidified bones that show an organisms body structure in the past
  2. 2. species that is no longer alive
  3. 3. medicine that protects you against harmful bacteria
  4. 5. changes over time that help you survive longer in a specific environment
  5. 6. number of organisms in a particular area
  6. 8. an organisms children
  7. 9. only found in plant cells; photosynthesis
  8. 10. process where organisms better adapt to their environment tend to survive
  9. 11. built up antibodies or cannot be affected by something