| A | B |
|---|
| Change in species over time | evolution |
| theory of how evolution occurs | natural selection |
| any evidence of past life | fossil |
| examples: bones, teeth, footprints | fossils |
| Use of radioactive elements to tell age of rocks | radioactive dating |
| the it takes for 1/2 of the radioactive atoms in a sample to decay into a new element | half-life |
| structures that are similar because they share common ancestry | homologous structures |
| parts of body now having little or no use | vestigial structures |
| pre-birth form of life | embryo |
| protein involved in cell respiration | cytochrome c |
| nucleic acid that shows relationships between organisms | DNA |
| bat's wing, human arm, dolphin fin: | homologous structures |
| whale pelvis, ear moving muscles, 'goose bump' muscles | vestigial structures |
| element that changes into another element is: | radioactive |
| the measure of element's rate of decay | half-life |
| element used to measure age of recent living things | carbon 14 |
| element used to measure age of earth and ancient rocks | uranium |
| after 2 half-lives, how much of original element remains(fraction) | 1/4 |
| half-life of carbon 14 | 5730 years |
| genus of modern horse | equus |
