In lower mammals, the release of the female sex hormone into the bloodstream, makes the female receptive to having sex with this period being referred to as

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In lower mammals, the release of the female sex hormone into the bloodstream leads to a period of sexual receptivity known as estrus. Menopause refers to the end of a female's reproductive capability, while androgyny refers to the presence of both male and female characteristics. Menses refers to the shedding of the uterine lining in some mammals, including humans.

In Lower Mammals, the Release of the Female Sex Hormone