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Saturday, November 19, 2016

6 major disadvantages of human evolution

Elements of process of human evolution Vector photo:
Thinking about natural selection, we tend to think that is progress, just how strong and healthy people survived and were assured continuity. But in reality, the process is more complicated than that. For this to happen, natural selection did sometimes compromise and thus, people have developed certain traits that are, in fact, a real challenge in our lives.

3. Births are complicated

Compared species of monkeys, the human species is experiencing a very complicated birth, due to the fact that people pelvis is narrow compared to the size of the head and shoulders babies. "The pelvis is responsible for two people's positions, moving 2 feet, and the possibility of birth," said Karen Rosenberg, a paleontologist at the University of Delaware. Pelvic shape is given by a compromise between the two. People came with an interesting cultural answer to explain this difference between apes and humans. While birth is one solitary mammals, women receive a significant assistance. Moreover, researchers have argued that natural selection favored seeking assistance during birth and, although the reason seems much easier to overcome fear and pain, had an important role in reducing mortality.

1. We have back pain

Emergence of bipedalism was a major development in the evolution of human bipedal position by allowing us to travel long distances to use our hands as we move, but, however, is a disadvantage.

If chimps and other quadrupeds akin to the human species, the backbone functions as a suspension bridge. "If the structure is placed horizontally in vertical position, it loses stability," said Jeremy DeSilva, a paleontologist at Dartmouth College. The simplest way to make a perfect structural backbone into a creature with a right upright as stacking the vertebrae, but the method for birth canal locks. Thus, the backbone must be involved in the process of bending, which can pave the way for an easier birth. The price you are paying back pain and movement disorders such as disk and fractures.

2. Anatomy feet I inherited from monkeys

If you analyze the existing prosthetic legs today, their structure resembles an ostrich leg. Human anatomy is not tracked because it is a little strange. DeSilva added that we inherited many elements of the anatomy of apes and legs are the best example. When we began on two legs, I did not need the flexibility of legs they have monkeys to climb trees, but because we inherited anatomy of apes, our legs and could be turned quite often, we face sprains and dislocations.

4. Crave for junk food

Sugar is an important element of energy, and the excess is converted into fat to cope with stressful moments in which we need more energy. Before the development of industry and agriculture when food sources were scarce or unreliable, sugar was necessary to survive. But nowadays, the sugar found in very many products, people exaggerate regarding its consumption. Thus, the current population is facing obesity and an increased risk of diabetes and high blood pressure.

"The food industry has been very successful because we have the anatomical aspects of the Stone Age people who needed sugar, but nowadays this is our health", says Daniel Lieberman, a biologist at Harvard University.

5. We are dealing with mental illness

Natural selection has not removed the risk of mental illnesses such as schizophrenia and depression, although these conditions are associated with low birth rate. Scientists have discovered that people with mental illness brothers who suffer from these diseases can result, however, children will have these problems. Other researchers have analyzed the origin of these diseases, concluding that they are closely linked to progress. For example, while some symptoms of depression can affect a person decisive, conditions that create an analytical style of thinking can be very productive in terms of solving problems.

6. The molars creates pain

When people began to be bipedal, there was a major transformation: our brain has increased. To accommodate the new dimensions of the brain, face shape changed and became more narrow jaws. For many, this meant that the three molars or wisdom teeth have not occurred for proper develop, so they were affected. If these teeth are not extracted, can be extremely painful and cause infections. However, natural selection is still in constant development, a genetic mutation that stops the emergence of wisdom teeth begin to form is becoming more widespread and more people no longer have three molars.

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The above post is reprinted from materials provided by Mentalfloss . Note: Materials may be edited for content and length.

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