Human Body Facts
Humans have as much follicle-producing hair as other primates.
Many people have the need to raise their feet or to ascend to a higher position while they are frightened or nervous. Evolutionary biologists believe that this is a leftover reflex from when early soil-dwelling mammals can climb trees when attacked.
Scientific research have shown that blushing tends to ease aggressive reactions by signaling that a person is embarrassed or apologetic. Studies suggest that blushing induces sympathy, which helps keep the topic alive. Humans are the only species that are capable of blushing.
One research showed that men who were starving favoured women who had a higher body weight. Researchers believe that this is due to an evolutionary reaction to resource scarcity; in other words, a heavier woman advertises access to more resources, such as food.
According to evolutionary biologists, women are more drawn to men with a broad jaw and pronounced brow formed by elevated levels of testosterone. Men are drawn to women with thinner chins and less pronounced brows, which indicate higher levels of estrogen.
Evolutionary biologists note that the symmetrical face is more appealing around the globe as similarity indicates positive genes for reproductive health.
Lip twitching while an ancestral remnant is frustrated.
Humans have relatively few hairs similar to other primates. Researchers claim that humans have created this function because 1) it has made it easier to feed food in shallow water, 2) it has allowed people to lose heat faster in hot savannas, and 3) it has helped to minimize the number of parasites in the body.
Eighty-five percent of the population cannot wiggle their ears or regulate the muscles of the Auricular is that circle the outer ear. Scientists suggest that this muscle has enabled human primate ancestors to turn their ears in various directions to distinguish the positions of the sounds. When they started living in groups, they lost the need to move their ears.
Mutations drive evolution by providing additional genes to the gene pool of the population. Many causes cause DNA mutations, including x-rays, cosmic rays, radioactive radiation, and random chemical reactions in a cell.