Biology remains the major of choice for students who desire to become medical doctors. However, biology, the study of living things, is a science that encompasses many specialties and opportunities for rewarding careers. Modern biology pursues the quest for a full understanding, at the molecular level, of the basic mechanisms underlying life processes, while also concerning itself with current social issues related to human health, behavior, overpopulation, and the impact made on the earth’s natural, life-sustaining environment. Many trained biologists and health professionals will be needed in the search for effective answers to such dilemmas as AIDS, cancer, autoimmune disorders, and inborn errors of metabolism.