| A | B |
|---|
| Occurs when the individuals at the middle of the frequency distribution are fittest for the environment. | stabilizing selection |
| A distinct population of organisms that have the same basic structure and can interbreed to produce fertile offspring. | species |
| Occurs when individuals at one end of the frequency distribution are better adapted to the environment than those in the middle or at the other end. | directional selection |
| The result of natural selection. Process by which a new species is formed. | speciation |
| All members of a species die and no longer exist or live on the Earth. | extinct |
| The process by which the organisms best suited to their environment survive and reproduce. | natural selection |
| All members of a species that live in an area. | population |
| Occurs when individuals near both ends of a frequency distribution are better adapted than those in the middle. | disruptive selection |
