Chapter 15

3. Species gone from earth forever.
6. the ability of populaton to survive and reproduce in a certain enviroment.
8. Resistance the ability of populatons of bacteria to evolve in response to antibiotics.
9. Record the collective, fossilized history of different groups of livig organisms.
12. Species Identified organisms that are "in between" ancient and modern forms.
15. Selection the scientific theory that describes how species best suited to survive in an enviroment will be the most successful at reproducing.

1. change over time.
2. when changes occur in genes.
4. of Evolution the scientific theory that explains how species on Earth change over time by natural selection.
5. species species already inhabiting the enviroment.
7. species also known as introduced spcies or invasive species, they are new to an area.
10. Structures a characteristic observed in different species that indicates that the species have a common ancestor.
11. genetic differences between individual organisms of the same spiecies.
13. a characteristic or genetic trait that enhances organisms' reproductive success and survival.
14. the process in which a new kind of organism, or species, evolves.