The three major naturally occurring estrogens in women are estrone (E1), estradiol (E2), and estriol (E3). Estradiol is the predominant estrogen during reproductive years both in terms of absolute serum levels as well as in terms of estrogenic activity.strogen may also refer to any substance, natural or synthetic that mimics the effects of the natural hormone. The steroid 17Î²-estradiol is the most potent and prevalent endogenous estrogen, but several metabolites of estradiol also have estrogenic hormonal activity.
The study of animal behavior begins with a library of behaviors, called an ethogram. An ethogram is a list of species-specific behaviors describing the elements and function of each behavior. Normally, the best ethograms are functional; they are organized into categories that reflect meaningful distinctions to the animal.
A portfolio matrix is a chart used to define products in terms of both the growth in their industry and their specific market share. To create a portfolio matrix, first draw a diagram with four squares.