| A | B |
|---|
| Adoptive Value | Any trait that helps an organism survive and produce under a set of environmental conditions. |
| Evolution | The process by which species have changed over time. |
| Extinction | The disappearance of all members of a species from earth |
| Fossil Record | A collection of fossil used to represent Earth's history |
| Genetic Variation | The normal differences found among offspring. |
| Geological Time | Earth's history as revealed by layers of rock. |
| Mutation | An alternation in the sequence of DNA. |
| Natural Selection | The process by which the organisms that are best adapted |
| Overproduction | The potential for a species to increase it's numbers |
| Theory | An explanation, supported by many observations and/or |
