| A | B |
|---|
| evolution | change over time |
| descent with modification | theory that all organisms came from earlier species |
| natural selection | theory that organisms which are suited to their environemnt will survive |
| scientific theory | a generally accepted and well-tested scientific explanation |
| hypothesis | an educated guess |
| adaptive advantage | characteristics which allow one organisms to more likely be successful |
| lethal mutation | a mutation that results int he death of an organism |
| vestigial structure | a body part that appears tob e useless but was probably useful to an earlier ancestor |
| homologous structure | a body part that is similar in related organisms. |
