| A | B |
|---|
| evolution | change over time |
| fossil | preserved remains or evidence of an ancient organism |
| natural variation | the differences among individuals of a species |
| artificial selection | the selection of humans for breeding of useful traits from the natural variation among different organisms |
| struggle for existence | the competition among members of a species for food, living space, and the other necessities of life |
| fitness | the ability of an organism to survive and reproduce in its environment |
| adaptation | the inherited characteristic that increases an organism's chance of survival |
| survival of the fittest | the process by which individuals that are better suited to their environment survive and reproduce most successfully; also called natural selection |
| natural selection | the process by which individuals that are better suited to their environment survive and reproduce mose successfully; also called survival of the fittest |
| homologous structure | structural features that have a common evolutionary origin |
| vestigial structure | a body structure that has not function but was probably useful to an ancestor |
| analogous structure | structures that have a similar function but do not have a common evolutionary origin |
| mimicry | a structural adaptation that enables on species to resembe another species |
| camouflage | an adaptation that enables species to blend with their surroundings |
| adaptation | any structure, behavior, or internal process that enables an organism to better survive |
