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What do we need two sexes for? What is the evolutionary significance of this phenomenon? What is the nature of the differences between the sexes? What is sexual dimorphism and what does it mean? How is it connected to other life phenomena? New evolutionary theory of sex differentiation developed by Dr. Biol. Sci. Vigen Geodakian has the answers. It provides a scientific justification for the existence of men and women, and the evolutionary roles that they play in family and society. The book is intended to scientists, teachers, students, and other professionals working in the fields of biology, medicine, psychology, sociology, anthropology, and many other related branches of science.