What is evolution and who is associated with it?

Evolution is the development of new characteristics and species over many generations which arises from changes in the environment. The idea (which has been called the single best idea ever had by a person) was that of Charles Darwin, an English naturalist and geologist.

The theory of natural selection comes along too. That is a random decision in which a species either thrives or becomes extinct. But sometimes extinction is caused by human interactions and environmental issues; not just by natural selection.