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The pelvis forms a junction of the spine, and its continuation the coccyx; and the two lower limbs. Earlier in evolution, the coccyx was an important balance item - consider the tail structure in many dinosaur and even in kangaroos and climbing animals.

In humans it also forms a convenient basin to help contain the abdominal contents, but most mammals get by with just muscular webs to serve this function.

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12y ago

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