| A | B |
|---|
| evolution | change over a period of time |
| diversity of life | variety of living things |
| fossils | bones and other traces of ancient organisms |
| adaptations | physical and behavioral traits the enable organisms to survive |
| fitness | the ability of an individual to survive and reproduce |
| homologous structures | develope similar tissues in the early developmental stages of the organism |
| vestigial organs | sturctures that have little or no purpose |
| artificial selecton | humans allow selected organisms to produce offspring |
| natural selection | the struggle for existence selects the fittest individuals to survive in nature |
| common descent | all living things share common ancesteros |
| mutations | changes in structures in DNA cause changes in the information carried in one or more of its genes |
| reproductive isolation | members of two different spedies cant interbreed |
| gene pools | individuals wihtin a species share a group of alleles |
| genetic drift | alleles can become more or less common in a population simply by chance(random chage in allele frequency) |
| speciation | the formation of new species |
| gradualism | evolutionary chage occurs steadily over long periods of time |
| punctuated equilibrium | long periods of stability that are interrupted by rapid change |
| adaptive radiation | diversity occuring in a newly evolved species in a relatively short period of time |
| convergent evolution | unrelated species may independently evove superficial similarities because of adaptations to similar enviroments |
| analogous structure | similar in appearance and in function but are developed from different parts |
| biodiversity | is the variety of organisms, the geneitc information they contain and the biological communities in which they live |
| molecular clocks | biological clocks that record how long ago living organisms shared a common ancestor |
