Across
- 2. a group of individuals who belong to the same species and live in the same area
- 5. A scientist who studies fossils
- 6. A graph of vertical bars representing the frequency distribution of a set of data
- 8. the very long time that spans the history of Earth, from the very first cellular life to the present
- 10. Based on observation or experiment, not on theory
- 13. the process by which species adapt to environmental change over a very long time
- 14. an older population from which two or more newer species descended
- 15. no longer in existence
Down
- 1. body structure in two or more species that features the same parts for example the same bones
- 3. A part of an organism
- 4. a trace of a once living organism
- 7. the formation of new and distinct species in the course of evolution
- 9. sharing a common ancestor population
- 11. arm,leg, wing
- 12. when something stays mostly the same over time
