Across
- 3. theory that states that natural disasters such as floods and volcanic eruptions have happened often and have shaped Earth's land forms and caused extinction of some species.
- 4. change in a species over time; process of biological change by which descendants come to differ from their ancestors.
- 5. structures that perform a similar function - in the case of flight- but are not similar in origin.
- 6. inherited trait that is selected for over time because it allows an organism to better survive and reproduce in its environment.
- 9. traces of organisms that existed in the past.
- 10. group of organisms so closely related that they can mate to reproduce fertile offspring.
- 12. selection mechanism by which individuals that have inherited beneficial adaptations produce more offspring on average than do other individuals.
- 15. selection process by which humans modify a species by breeding it for certain traits.
- 16. structure/body part that is similar in structure on different organisms but performs different functions.
Down
- 1. ability of a trait to be passed from one generation to the next.
- 2. theory that states that the geologic processes that shape Earth are uniform through time. (Changes which happened a long time ago are still happening today)
- 7. all of the individuals of a species that live in the same area.
- 8. structure/remnants of organs or structures that functioned in an earlier ancestor and no longer serve a useful function.
- 11. the differences in the physical traits of an individual from those of other individuals in the group to which it belongs
- 13. principle that states that the changes in land forms result from slow changes over a long period of time.
- 14. measure of an organism's ability to survive and produce offspring relative to other members of a population in a given environment