| A | B |
|---|
| species | a group of similar organisms that can mate with each other and produce fertile offspring |
| adaptation | is a trait that helps an organism survive and reproduce |
| scientific theory | a well tested concept that explains a wide range of observations |
| natural selection | the process by which individuals that are better adapted to their environment are more likely to survivie and reproduce |
| fossils | the preserved remains or traces of an organism that lived in the past |
| sedimentary rock | rock made of hardened sediment |
| mold | a hollow space in sediment in the shape of an organism or part of an organism |
| cast | a mold that becomes filled with hardened minerals |
| relative dating | a way tot determine which of two fossils is older |
| absolute dating | a way to determine the actual age of fossils |
| extinct | a species that has no living members is _____ |
