Bipedalism is one of the two principal features that are unique to humans among all living primates: the other being a very large brain in proportion to the body. Of these, bipedalism appeared long before the other. Australopithecus afarensis anatomy display many anatomical features of habitual …show more content…
However, this shift had its disadvantages as well. Standing upright, while it provides a better view of the terrain, increases exposure to predators. Standing or walking on two feet while hoisting or transporting heavy objects for long periods of time can result in back injuries, such as arthritis and slipped intervertebral disks. Bipedalism also causes strain on the circulatory system as it moves blood from the legs to the heart. This stress can lead to the development of varicose veins, a condition in which veins become prominent due to overwork. Finally, if one of a biped’s feet is injured, then his ability to walk can be seriously restricted. Unable to travel about the landscape, an early hominid would have had a limited chance of survival (Larsen,