Theory of Evolution

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Across
  1. 2. a event that occurred before a given time
  2. 4. Something you are
  3. 6. any heritable trait that helps an organism,
  4. 8. develop gradually
  5. 10. A animal people might think we evolved from
  6. 12. a event that occurred after a given time
  7. 13. a change in characteristics of a species
Down
  1. 1. to study or follow the development of in detail
  2. 3. an aspect of the natural world that can incorporate laws
  3. 5. all living or elements are animals, plant
  4. 6. multicellular eukaryotes
  5. 7. measurable period during an action
  6. 9. help you learn about your family history
  7. 11. a period of time happening now