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Ch 11 Change/Time
change over time
| Term | Definition |
|---|---|
| species | a group of similar organisms that can mate with each other and produce fertile offspring |
| fossil | preserved remains or traces of an organism that lived in the past |
| adaptation | a trait that increases an organism's ability to survive and reporduce |
| evolution | the process of change over time |
| 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 survive and reproduce |
| variation | any difference between individuals of the same species |
| Darwin's hypothesis | species change over many generations and become better adapted to new conditions |
| Galapagos Islands | where Darwin observed strange variations in species |
| Artificial selection | only the organisms with a desired characteristic are bred |
| Factors that affect natural selection | -overproduction -variation -competition |
| homologous structures | similar structures that related species inherit from a common ancestor |
| gradualism | involves small changes that add up to major changes over a long period of time |
| punctuated equilibrium | a pattern where species evolve during short periods of rapid change and then don't change much |
Created by:
Ms. Begley
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