Evolution

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Across
  1. 4. selective agent
  2. 5. ability of a trait to be passed down
  3. 8. a characteristic shared by two species
  4. 9. measure of survival ability
Down
  1. 1. the mechanism of evolution
  2. 2. study of fossils or extinct organisms
  3. 3. difference in a physical trait among
  4. 6. cannot evolve
  5. 7. characteristics and diversity of life
  6. 10. group of organisms that can reproduce