Across
- 3. time scale representing the history of Earth
- 5. science of classifying and naming organisms
- 7. body part that is similar in function as a body part of another organism but is structurally different
- 9. measure of an organism's ability to survive and produce offspring relative of other members of a population
- 11. theory that states that natural disasters such as floods and volcanic eruptions shaped Earth's landforms and caused extinction of some species
- 13. trace of an organism from the past
- 14. smallest unit of time, seven million years
- 15. change in a species over time
Down
- 1. all the individuals of a species that live in the same area
- 2. elimination of a species from Earth
- 4. diagram displays proposed evolutionary relationships among a group of species
- 6. process by which humans modify a species by breeding it for certain traits
- 8. difference in physical traits of an individual from the group to which it belongs
- 10. 2nd largest unit of geologic time
- 12. group of organisms that are similar to one another that they can breed and produce fertile offspring