Females with 3 breast
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A female individual cannot reproduce sexually without access to the gametes of a male, and vice versa. Some organisms can also reproduce by themselves in a process known as asexual reproduction. An example of asexual reproduction that some female species can perform is parthenogenesis. There is no single genetic mechanism behind sex differences in different species and the existence of two sexes seems to have evolved multiple times independently in different evolutionary lineages. Oogamy is a form of anisogamy. There is an argument that this pattern was driven by the physical constraints on the mechanisms by which two gametes get together as required for sexual reproduction.
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Breast cancer incidence (invasive) statistics
Breast - Wikipedia
Risks Oxytocin is a hormone and a neurotransmitter that is involved in childbirth and breast-feeding. It is also associated with empathy, trust, sexual activity, and relationship-building. It is sometimes referred to as the "love hormone," because levels of oxytocin increase during hugging and orgasm. It may also have benefits as a treatment for a number of conditions, including depression , anxiety , and intestinal problems. Oxytocin is produced in the hypothalamus, a part of the brain. Females usually have higher levels than males. Fast facts on oxytocin Here are some key points about oxytocin.
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Lifetime Risk of Developing or Dying From Cancer
Skin In women, the breasts overlie the pectoralis major muscles and usually extend from the level of the second rib to the level of the sixth rib in the front of the human rib cage ; thus, the breasts cover much of the chest area and the chest walls. At the front of the chest, the breast tissue can extend from the clavicle collarbone to the middle of the sternum breastbone. At the sides of the chest, the breast tissue can extend into the axilla armpit , and can reach as far to the back as the latissimus dorsi muscle , extending from the lower back to the humerus bone the longest bone of the upper arm. As a mammary gland , the breast is composed of differing layers of tissue , predominantly two types: The suspensory Cooper's ligaments are fibrous-tissue prolongations that radiate from the superficial fascia to the skin envelope.
Please fill out required fields. Lifetime risk estimates assume a life expectancy of 90 years. Evidence Appraisal The original Gail model also known as Gail model 1 was developed in using data derived from a subset of the Breast Cancer Detection Demonstration Project, a breast cancer screening program that ran from to , and was initially designed to predict the risk of developing invasive cancer or carcinoma in situ.
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