Which of the following does Democritus not say?the needy man knows how much he needsthaleswateranaximenesairpythagoreasnumbersparmenidesbeing which is complete and constantheraclituschange is permanentempedoclesfour elements: air, earth, fire, waterleucippusthe atomdemocrituskey philosopher in atomismprotagorasman is the measure of all thingsgorgiasnothing existscratylusone could not step in the same river once