ELA.6.9A Compare and contrast the stated or implied purposes (e.g., inform, influence, entertain, express) of different authors writing on the same topic. ELA.6.10A Summarize the main ideas and supporting details in text, demonstrating an understanding that a summary does not include opinions.
The shape of the breast, its size, position of nipple and their numbers are also genetically determined. Any alteration in the basic genes or the presence of a predetermined gene that governs the shape and size of the nipples can cause the nipples to be inverted.
If the nipple is permanently inverted and does not evert with stimulation, then it is a useless nipple when it comes to sensitivity and/or breast-feeding. In these cases correction of inversion is indicated (because the potential gains outweigh the risks outlined above).