There exists also sizeable variation in size involving men and women. Lasting breast advancement in the course of puberty is attributable to estrogens in conjunction with the growth hormone. Woman humans are the one mammals that completely develop breasts at puberty; all other mammals produce their mammary tissue through the https://grok.com/share/c2hhcmQtMw%3D%3D_5ad6450c-533d-442c-a09c-9f7bce1babfb