Males and females differing in size can specialize in, and more fully exploit, different food resources while avoiding competing with each other; furthermore, body size can be useful in avoiding predators and may also be of assistance hormones responsible for secondary sex characteristics girls in Berkeley securing a mate.
The ovarian cycle governs the preparation of endocrine tissues and release of eggs, while the menstrual cycle governs the preparation and maintenance of the uterine lining. Estradiol produces secondary sex characteristics in females, while both estradiol and progesterone regulate the menstrual cycle.
The male and female reproductive cycles are controlled by hormones released from the hypothalamus and anterior pituitary as well as hormones from reproductive tissues and organs.
The corpus luteum produces estrogen and progesterone. LH also plays a role in the development of ova, induction of ovulation, and stimulation of estradiol and progesterone production by the ovaries. Psychological development Morality Religion Depression Educational psychology Evolutionary aesthetics Music Darwinian literary studies Evolution of emotion.
Sex hormones are responsible for some of the most dramatic changes that occur in the body. It is concluded that androgens normally prevent the development of nipples and extensive formation of mammary tissue in male fetuses. The changes at puberty are concerned more with widening the pelvic inlet and broadening the much more noticeable hips.
An egg can survive for around 12—24 hours after leaving the ovary. Hair grows on face and body. Physical and behavioral interaction Children vary greatly in their tempo of growth.
Introduction to evolution Common descent Evidence. Like their female counterparts, males also use visual information about a potential mate, as well as voice, body shape, and an assortment of other factors in selecting a partner. Jerome H. Males and females differing in size can specialize in, and more fully exploit, different food resources while avoiding competing with each other; furthermore, body size can be useful in avoiding predators and may also be of assistance in securing a mate.