Is Evolution a Fact or a Theory? Both. In Darwin's day, and before, many naturalists theorized that living things were somehow related in a manner beyond that of their obvious common differences from non-living matter. These speculations, including those of Darwin, are appropriately termed theori...

In 1859, Charles Darwin developed a theory explaining the history of our evolution. He also came up with the idea of Natural Selection. This is the idea that the environment an organism lives in helps to determine which organisms survive and produce young, and which do not. When Darwin was a youn...