| A | B |
|---|
| Gene pool | A group of interbreeding organisms. |
| Anaximander and Lucretius | Supposed that all living things were related, long before modern theories of evolution came about. |
| James Hutton | The Father of Modern Geology. |
| Erasmus Darwin | Wrote on botany and zoology, but offered no mechanism to explain evolotion. |
| George-Louis LeClerc, Comte de Buffon | Provided evidence of descent with modification over 100 years before the voyage of the Beagle. |
| James Ussher | An archbishop who calculated the age of the Earth. |
| Thomas Malthus | Published theories in 1798 about human populations. |
| Variation | States that all organisms are flexible in their traits. |
| William Smith | Developed the first accurate geologic map of England. |
