The Engine of Change

7. A body part or organ that an organism inherited from an ancestor but no longer has a significant or clear function in the modern species.
9. The gradual change in a species over time.
10. The job or role of a body part, like how the heart pumps blood or lungs help you breathe.
11. A specific characteristic of an individual that can be determined by genes, environmental factors or by a combination of both. These can be qualitative (such as eye color) or quantitative (such as height).
12. Body parts that are structurally similar in related species; these provide evidence that the structures were inherited from a common ancestor.

1. The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.
2. An ancient living thing that two or more different species came from.
3. The different parts of an organism's body, like its organs, bones, and tissues.
4. A characteristic that helps an organism survive in its environment and/or reproduce.
5. Any difference between individuals of the same species.
6. The physical arrangement of parts within a living thing, from the tiniest cell to a whole organism.
8. Differences in the genetic code (DNA) within a species that lead to unique features in each individual (like hair color or eye color).