| A | B |
|---|
| Species | a group of similar organisms whose members can mate with one another |
| adaptation | A characteristic that helps an organism survive in its environment or reproduce. |
| evolution | The gradual change in a species over time |
| natural selection | the process by which individuals that are better adapted to their environment ar more likely to survive and reproduce than other members. |
| over production | too many offspring to survive |
| competition | The struggle between organisms for the limited resources in a habitat |
| variation | any difference between members of the same species |
| fossil | the preserved remains or traces of an organism |
| mutation | a change in a gene or chromosome |
| Pangaea | When Earth's land masses were connected as one land mass |
| sedimentary rock | A type of rock that forms when particles from other rocks or the remains of plants and animals are pressed and cemented together |
| petrified fossils | a fossil in which minerals replace all or part of an organism |
| mold | a hollow space in sediment in the shape of an organism |
| cast | a copy of the shape of an organism that made a mold |
| Galapagos Islands | A group of small islands in the Pacific Ocean off the west coast of South America |
