1. “LIFE CHANGES OVER TIME “STUDY GUIDE

2. A species is a group of organisms that look alike and can reproduce among themselves.

3. Evolution is the process by which species change over time.

4. An adaptation is a feature or trait that helps an organism to live in a certain environment.

5. A sudden change in a gene is called a mutation. It can be harmful or helpful .

6. Animals or plants that no longer exist are said to be extinct.

7. Fossils are the remains or traces of once-living organisms.

8. Amber is fossilized tree sap in which ancient insects are sometimes preserved.

9. Homologous structures are body parts that have the same basic structure like the arm of a human, the leg of a cat, the flipper of a whale, or the wing of a bat.

10. Vestigial structures are body parts that seem to have no function like a human being’s appendix.

11. Darwin’s theory of natural selection is that offspring with the most favorable traits survive and reproduce.

12. Differences in traits among organisms in a species is called variation.

13. Anthropology is the study of human beings.