Geological Time

2. Genetic material carrying hereditary information.
4. Species that no longer exists.
6. Layers of sedimentary rock.
8. Study of ancient life through fossils.
9. Molecule built from amino acids that performs cellular functions.
10. A principle stating that in layers of sedimentary rock, older layers lie beneath younger layers.
11. A theory that evolutionary change occurs slowly and steadily over time.
12. Observable traits of an organism.
13. The sudden emergence of new species in the fossil record without clear transitional forms.
14. Study of the distribution of species across space and time.
15. Similar structures due to common ancestry.

1. A period in which a species does not undergo significant evolutionary change.
3. Preserved remains or traces of ancient organisms.
4. Study of development before birth.
5. Change in populations over time.
7. Fossil showing intermediate features between groups.