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I outline a histological test of this hypothesis. I outline a hypothesis that suggests that the difference in muscular performance between the two species is caused by chimpanzees having many fewer small motor units than humans, which leads them, in turn, to contract more muscle fibers earlier in any particular task. The fossil record can shed light on when the change from power to speed occurred. The corresponding speed that human limb systems gain at the expense of power is critical for effective human activities such as running, throwing, and manipulation, including tool making. Great apes are adapted for strength-chimpanzees have been shown to be about four times as strong as fit young humans when normalized for body size. There are two types of Gorillas, the Western, and the Eastern Gorilla. They are herbivorous apes, native to the forests of Sub-Saharan Africa. Compared to male gorillas, female gorillas are quite smaller. More than 50 years ago, Maynard Smith and Savage (1956) showed that the musculoskeletal systems of mammals can be adapted for strength at one extreme and speed at the other but not both. Gorillas are the largest primates with a height up to 1.8 m (5 ft 11 in), and an average weight of 200 kg.
![gorilla vs ape gorilla vs ape](https://i.pinimg.com/originals/d9/b5/dd/d9b5dd760d9f302d9b7e22735688e067.jpg)
I do not have such grand goals instead, I seek to understand a major difference between the living great apes and humans. He was one of the first to attempt this, and the paper has since become a classic. Cliff Jolly developed a causal model of human origins in his paper “The Seed‐Eaters,” published in 1970.