There are two kinds of division of labor: that based on age and that based on sex. Division of labor by age results in the obvious biological fact that human beings (62) three major periods of development. In childhood, the human is in large part dependent upon adults for food, shelter, and other (63) ; he has neither the strength nor the skills to (64) for himself. Children, in most societies, have only light tasks as helpers (65) adults or none at all, and when duties are (66) , these are often regarded as educational, to prepare the child for his adult (67) Adulthood is ordinarily the period of greatest vigor and ability. The adult man or woman (68) on full responsibility for the duties of his/her sex and special occupation. In many societies, in particular those (69) the technology requires physical strength and stamina, the adult in the prime of life (70) a dominant role and is often assigned the more responsible position in the group. Old age, since it inevitably brings (71) a loss in muscular vigor and a decline in sight, hearing and coordination, again results in a change in occupational status. This does not necessarily mean that the old lose (72) ; many societies make full use of their older members’ experience and wisdom and employ them to direct the efforts of the more vigorous (73) no-so-experienced adults. Sex division of labor is more difficult to (74) for in strictly biological terms. A careful survey of the division of labor by sex lends little support to the often-repeated (75) that women are (76) only for occupations that require relatively little skill or intelligence. In recent years women, freed from economic (77) to men, have shown themselves fully (78) in nearly all professions in which they have been given the opportunity to participate. Man’s wider range of occupation and the fact (79) he very often occupies the more important positions of leadership in human societies, is probably (80) due to his allegedly superior intelligence than to his greater freedom from the biological function of childbirth and the necessarily (81) duties in the care of infant.