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Sagot :
In humans, pubertal mammary development begins in girls between the ages of 8 and 13, and it leads to functional mammary glands,
The mammary gland is an exocrine organ that secretes milk to sustain the young in humans and other mammals. Mammals get their name from the Latin word mamma, which meaning "breast." The mammary glands are found in the breast of primates (including humans and chimpanzees), the udder of ruminants (such as cows, goats, sheep, and deer), and the dugs of other animals (for example, dogs and cats).
The mammary glans provide advantage to mammals to nourish their young ones and helped in making mammals most successful groups in the world in term of colonization of natural resources. Lactorrhea, the infrequent production of milk by the glands, can happen in any mammal, but lactation, the production of sufficient milk for nursing, often only happens in phenotypic females who have recently given birth. It is controlled by sex steroids' hormonal input. In a few mammalian species, male lactation can occur.
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