The Theory of Evolution was notably introduced by naturalist Charles Darwin during the 1800s. It asserts that a species innately evolves through a passage of time by means of natural selection; this development within the organism allows the species to appropriately adapt to its environment. Furthermore, it mentions that different species can originate from a common ancestor. This relatively modern theory, however, is not the first of its time. Several philosophers and naturalists prior to and following Darwin’s time have been conducive in establishing the basis of modern evolution today.