| A | B |
|---|
| Selective Breeding | The breeding of organisms that have certain desired traits. |
| Trait | A distinguishing quality that can be passed from one generation to another. |
| Vestigial Structure | The remnant of a once-useful anatomical structure. |
| Species | A group of organisms taht can mate with one another and produce fertile offspring. |
| Adaptation | A characteristic that helps an organism survive in its environment. |
| Fossil | The solidified remains or imprints of a once living organism. |
| Evolution | The process by which populations accumulate inherited changes over time. |
| Fossil Record | A historical sequence of life indicated by fossils found in layers of the Earth's crust. |
| Natual Selection | The process by which organisms with favorable traits survive and reproduce at a higher rate than organisms without the favorable trait. |
| Mutation | A change in the order of the bases in an organism's DNA. |
| Generation Time | The period between the birth of one generation and the birth of the next generation. |
| Speciation | The process by which two populations of teh same species become so different that they could no longer interbreed. |
| Charles Darwin | English naturalist who proposed the theory of evolution by means of natural selection. |
