| A | B |
|---|
| Adaptation | a change in structure or habits (behavior), often hereditary, by which an organism improves its condition in relationship to its environment |
| Dichotomous key | a tool used to identify species of organisms using opposing observable characteristics |
| Natural selection | process by which gene frequencies in a population change through certain individuals producing more offspring than others because they are better able to survive and reproduce organisms better suited to their environment |
| population | all of the members of a species living in a particular area at a particular time |
| physiology | the way in which a living organism or bodily part functions |
| Selective breeding | making deliberate crosses of plants or mating of animals, so the offspring will have a desired characteristic derived from one of the parents |
| Species | a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. |
| Variation | a different form or version of something |
