Nature is more kind to women than the male dominated human society. Natural selection helped women bodies to evolve spines that are more flexible and supportive than men’s to prevent women from tipping over while walking during pregnancy. A study made by Harvard anthropologist Katherine Whitcome has found this new adaptation mechanism in a new study that has been published in the Dec. 13 issue of the journal Nature.
During pregnancy with the belly bulging out the centre of gravity of pregnant woman would be displaced as she is walking that would make her fall down. Natural selection enabled women body to curve across three vertebras increasing her lordosis or curvature of the spine in the lower back to realign her centre of gravity above her hips and offsetting destabilization of the body weight.
Such adaptation are missing in the Chimps but were present in early humans called Australopithecus. In fossils two million years old anthropologists found that, females had three lordosis vertebras.
Women two million years ago or in the modern age always lead strenuous life. Pregnancy does not stall activity and the discomfort of child bearing also needs to be coped with. There is more equality in male-female physical structure in the world of four-footed animals including our early ancestors – the Chimpanzees. The female Chimps walk on four feet and their belly hang low to prevent the centre of gravity to be displaced while walking during pregnancy.
Source:yahoo
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