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The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known colloquially as the sit bones or sitz bones, [1] or as a pair the sitting bones, [2] is a large posterior bony protuberance on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
The Thinker by Auguste Rodin. Sitting is a basic action and resting position in which the body weight is supported primarily by the bony ischial tuberosities with the buttocks in contact with the ground or a horizontal surface such as a chair seat, instead of by the lower limbs as in standing, squatting or kneeling.
Bone artifacts and an ash seam dated to 32,000±1000 BP. [54] Europe: France: 32: Chauvet Cave: The cave paintings in the Chauvet Cave in southern France have been called the earliest known cave art, though the dating is uncertain. [55] Europe: Czech Republic: 31: Mladeč caves: Oldest human bones that clearly represent a human settlement in ...
Tests of animal bones found nearby suggest that the climate was harsh — comparable to modern-day Siberia. That means humans were having success in an extreme climate some 45,000 years ago.
Jewish traditions teach that the luz is the bone from which the body will be rebuilt at the time of resurrection, and share the idea that this bone does not decay. [2] Rabbi Shraga Simmons teaches that destruction of this bone by cremation could prevent resurrection. [3] Interpretations disagree as to where in the spine the luz is located.
A bat is a mammal and its forearm bones have been adapted for flight. Strong evidence for evolution comes from the analysis of homologous structures: structures in different species that no longer perform the same task but which share a similar structure. [48] Such is the case of the forelimbs of mammals.
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