Natural Selection

2. A random change in the DNA sequence that can introduce new traits into a population
4. A group of organisms born around the same time.
9. A scientist who studies fossils and ancient life.
11. The process where organisms with helpful traits are more likely to survive and reproduce.
12. Differences in traits among individuals in a population.

1. When all members of a species die out.
3. The preserved remains or traces of an organism from the past.
5. Rock formed from layers of sand, mud, and other materials; often contains fossils.
6. A trait that helps an organism survive in its environment.
7. A group of the same species living in the same area.
8. The gradual change of species over long periods of time.
10. A group of organisms that can mate and produce offspring.