 It can also be said to have included the Atomists, Leucippus and Democritus.The Pluralists rejected the idea that the diversity of nature can be reduced to a single principle (monism).Anaxagoras posited that nature contained an innumerable number of principles, while Empedocles reduced nature to four elements (fire, air, earth, and water) which could not be reduced to one another and which would be sufficient to explain change and diversity.