Emma 14 Extra Credit

1. structures leftover body parts that no longer serve an important function.
3. layers of rock or soil formed over time.
5. age the exact age of a rock, fossil, or object, usually measured in years.
8. a trait that helps an organism survive and reproduce.
10. tree a diagram that shows evolutionary relationships among species.
12. the idea that Earth’s features were shaped by sudden disasters such as floods or volcanic eruptions.
13. age the age of something compared to something else, not an exact number.
14. structures body parts that are similar because they came from a common ancestor.
15. evolution when unrelated species evolve similar traits because they live in similar environments.
17. characteristics traits gained during an organism’s lifetime that were once believed could be passed to offspring.
19. structures body parts with similar functions but different evolutionary origins.
20. radiation the rapid evolution of many species from one common ancestor.
22. selection the process in which organisms with helpful traits are more likely to survive and reproduce.

2. the process by which species change over time through inherited traits.
4. selection when humans breed organisms for desired traits.
6. the study of embryos and their development.
7. an organism’s ability to survive and reproduce in its environment.
9. species a species that shows traits of both older and newer groups in evolution.
11. when two species evolve in response to each other.
16. the study of where organisms live and how they are distributed on Earth.
18. evolution when related species become more different over time.
21. with modification the idea that species change over generations and share common ancestors.