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Why textbooks may need to update what they say about birth channels

To investigate the thought she and Dr. were measured. Manica 348 skeletons from all over the world. They found that…

To investigate the thought she and Dr. were measured. Manica 348 skeletons from all over the world. They found that the pelvic shape varied enormously, even more than bone, arm and general body parts as are known to vary considerably between populations. It was “remarkable and unexpected,” wrote the researchers.

For the most part, they found that the brook shape varied along geographic pathways. People with sub-Saharan origin generally had the deepest streams from behind, while the Indians had the widest side by side. Europeans, North Africans and Asians fell in the middle of the range.

The birth canal form also varied markedly in the population, although the variation decreased the more a population originated from Africa. The fact that the finding is consistent with others indicates that the population’s genetic diversity decreases, the farther moves from the cradle of humanity

M the cheese of the variation in the pelvic shape was derived from ] random fluctuations in the gene frequency, although natural selection seems to have played a minor role, too, said Betti. The upper part of the birth canal is slightly wider in populations from colder climates, perhaps to make the body stockier .

The variation observed by Dr. Betti suggests that the pelvic shape is not so strictly controlled. And if the pelvic shape is highly variable over populations, it is likely that “the birth process is also very variable,” says Helen Kurki, an anthropology professor at the University of Victoria, Canada.

These findings challenge the idea that “there is a” right “way to raise a baby, Dr. Kurki says and suggests that a more individualized approach to childbirth may be better.

Although people differ anatomically, Dr. Betti said that her research suggests that those differences are not always functional.

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