The Correct Answer is Option 3. • Aristotle • Aristotle (384–322 BC) was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, was the founder of the Lyceum, the Peripatetic school of philosophy, and the Aristotelian tradition. • His writings cover many subjects including physics, biology, zoology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics, meteorology, geology, and government. • Aristotle was the first person to study biology systematically, and biology forms a large part of his writings. That's why he is called as Father of Biology. His apparent emphasis on animals rather than plants is a historical accident: his works on botany have been lost, but two books on plants by his pupil Theophrastus have survived. • Theophrastus • Theophrastus (371-287 BC), a Greek native of Eresos in Lesbos, was the successor to Aristotle in the Peripatetic school. His given name was Tyrtamus was given by Aristotle for his 'divine style of expression'. • He is often considered the father of botany for his works on plants. • The interests of Theophrastus were wide-ranging, extending from biology and physics to ethics and metaphysics. • Hippocrates • Hippocrates (460 – c. 370 BC), also known as Hippocrates II, was a Greek physician of the Age of Pericles (Classical Greece), who is considered one of the most outstanding figures in history of medicine. • He is traditionally referred to as the "Father of Medicine" in recognition of his lasting contributions to the field, such as the use of prognosis and clinical observation, the systematic categorization of diseases, or the formulation of the humoral theory. • Gregor Johann Mendel • He is the father of the modern science of genetics • Though farmers had known for millennia that crossbreeding of animals and plants could favor certain desirable traits, Mendel's pea plant experiments conducted between 1856 and 1863 established many of the rules of heredity, now referred to as the laws of Mendelian inheritance.