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.
Please sign in to vote on this Guide. Write a guide. A lithograph is a type of artwork made by the process of lithography, which means printing from a metal plate or stone with a smooth surface, usually onto paper. This method was first used in the late 1700s as a way to publish theatrical works.ithography can be used in the printing of artwork or text onto paper or other materials. Originally, lithography used wax, oil, or fat to draw on a smooth, level plate or stone. The stone was treated with a mixture of gum arabic and acid, which etched the parts of the stone not protected by the oil-based image.