Aristotle (384-322 BC) was a student of Plato and a tutor to Alexander the Great. He was a genius Greek philosopher andscientist of the ancient age. Born on 384 BC Aristotle was a biologist, a zoologist, ethicist, a political scientist and the master ofrhetoric and logicHe also gave theories in physics and metaphysics. Aristotle gained knowledge in different fields with his expansive mind andprodigious writings. However, only a fraction of his writings are preserved at present. Aristotle made collections of plant and animal specimens and classified them according to their characteristics which made astandard for future work. He further gave theories on the philosophy of science,Aristotle also elaborated and estimated the size of the earth which Plato assumed to be a globe. Aristotle explained the chain oflife through his study in flora and fauna where it turned from simple to more complex,How did Aristotle get knowledge in different fields?​.