Natural Selection

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Across
  1. 3. Islands in South America
  2. 6. bacteria found in digestive track of animals
  3. 7. biologist who invented natural selection
  4. 8. change in genetic material (DNA)
  5. 9. scientist who studies biology
Down
  1. 1. characteristic belonging to a population
  2. 2. differences in the same trait in a species
  3. 4. determines a person's characteristics
  4. 5. something that helps an organism survive better