The basic components of a mature mammary gland are thealveoli<span> (hollow cavities, a few millimeters large) lined with milk-secreting cuboidal cells and surrounded by myoepithelial cells. These </span>alveoli<span> join to form groups known as </span>lobules. Eachlobule<span> has a lactiferous duct that drains into openings in the</span>nipple<span>.
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A. epithelial cells form from the body's skin
The plant diversity decrease making that plant existence extinct