| A | B |
|---|
| evolution | process that produces biological diversity |
| Darwin's theory of evolution | species evolved from ancestral ones & eveolution occurs by natural selection |
| natural selection | traits produce or enhance organism's ability to survive and reproduce |
| for natural selection to occur | organisms must have variations |
| struggle for survival occurs because | each generation produces more offspring than can survive |
| adaptation | in the struggle to survive those best suited to their environment survive |
| fossil record | remnants or traces of organisms from geologic ages past |
| vertebrates | animals with backbones |
| time line for vertebrates | fish, amphibians, reptiles, mammels, birds |
| biogeography | geographical distribution of plants and animals |
| comparative anatomy | comparisin of organisms structure |
| molecular biology | biology at the molecular level |
| comparative embryology | comparason of organism's embryos |
| molecular biology | bioology at the molecular level |
