Evolution/Natural Selection Crossword

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Across
  1. 2. variety of living things on Earth
  2. 4. structures in an organism that are not necessary for survival
  3. 7. immunity that your body creates
  4. 8. used to help fight infectious bacteria
  5. 9. weakened or dead pathogens that are given to someone to help create memory cells
  6. 10. immunity given to someone from the outside of the body
  7. 12. strengthens or weakens inheritable traits
  8. 15. these organisms have no nucleus or membrane bound organelles
  9. 17. an example of natural selection
  10. 19. carries out cellular respiration
  11. 20. Heritable change in characteristics within a population from one generation to the next
Down
  1. 1. used to help find common ancestors between organisms
  2. 3. bacteria that has mutated to become immune to antibiotics
  3. 5. an adaptation against malaria
  4. 6. stops gene flow and leads to speciation
  5. 11. used to help fight viruses
  6. 13. the theory that states that eukaryotes evolved from prokaryotes
  7. 14. a group of the same species
  8. 16. creation of a new species
  9. 18. the estimated age of a fossil