Chapter 3

4. Body parts that have lost their original function throughout evolution..
6. The impression of an organism in a rock.
9. Body parts that perform a similar function but differ in structure.
12. The study of similarities and differences among structures of living species.
13. An adaptation that enables a species to blend in with its environment.
14. The breeding of organisms for desired characteristics.
16. made up of all the fossils ever discovered on Earth.
18. The change over time in populations of related organisms.
19. A person who studies plants and animals by observing them.

1. The resemblance of one species to another species.
2. Body parts of organisms that are similar in structure and position but different in function.
3. The process by which populations of organisms with variations that help them survive in their environments live longer, compete better, and reproduce more than those that do not have the variations.
5. A chart that divides Earth's history into different time units.
7. A slight difference in an inherited train of individual members of a species.
8. An inherited trait that increases an organism's chance of surviving and reproducing in its environment.
10. The preserved evidence of the activity of an organism.
11. Occurs when the last individual organism of a species dies.
15. The science of the development of embryos from fertilization to birth.
17. A fossil copy of an organism in a rock.