| A | B |
| Charles Darwin | English naturalist who studied evolution |
| HMS Beagle | ship on which Darwin sailed |
| Jean Baptiste Lamarck | According to this french scientist, evolution occurs as structure develop through use |
| Galapagos Islands | where Darwin studied finches |
| Thomas Malthus | wrote "Essay on the Principle of Population" |
| natural selection | process by which populations change in response to their environment |
| adaptation | the changing of a species that results in its being better adapted to its environment |
| extinct | to disappear permanently |
| fossil | preserved or mineralized remains or traces of an organism |
| paleontologist | scientist who studies fossils |
| homologous structure | structures that share a common ancestry |
| vestigial structure | a structure that has been reduced in size and/or function |
| industrial melanism | the darking of organisms in response to industrial pollution |
| H.B.D. Kettlewell | performed experiments with peppered moths |
| geographical isolation | groups are physically separated |