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