| A | B |
|---|
| species | a group of organisms that share similar characteristics |
| evolution | change in inherited characteristics over time |
| natural selection | Darwin's theory of evolution |
| gradualism | the model for slow, ongoing process of evolution |
| punctuated equilibrium | the model for rapid evolution |
| sedimentary | kind of rock in which fossils are often found. |
| element | each radioactive_______of radiation at different rate |
| embryology | the study of embryos and their developement |
| vestigal | structures that have no purpose |
| primates | animals with opposable thumbs and binocular vision |
| hominids | humanlike primates of 4 to 6 million years ago |
| homo sapiens | early humans |
| variations | an inheritated trait that makes an individual different |
