Fossils Vocab

5. _______________Structure: Body parts of an organism that are similar in structure and position, but different in function.
6. The study of similarities and differences among structures of living species.
8. Principle that states that the oldest rocks are on the bottom layers and newest rocks are on the top layers.
11. _______________Structure: Body parts of organisms that has lost its original function through evolution.
14. Variation or differences among life forms.
15. The science of the development of embryos from fertilization to birth.
16. The impression of an organism in a rock.

1. _______________Structure: Body parts of organisms that perform a similar function but differ in structure.
2. The change over time in populations of related organisms.
3. ________Fossils: Fossils of species that existed for a short time and can be used to date rocks.
4. A fossil copy of an organism made when a mold is filled with sediment.
7. Remains, impressions, tracks, or other evidence of ancient organisms.
9. Record of all the fossils ever discovered on Earth.
10. _________Fossils: Organisms that appear to be similar to species only known from fossils.
12. An event that occurs when the last individual organism of a species dies.
13. _________Fossils: The preserved evidence of the activity of an organism.