Human Ancestry Essay

1661 words - 7 pages

This is a good solid paper Try to use more specificsThe evolutionary relationships of Australopithecus and Homo are still argued today among top anthropologists. The direct human phylogeny is not certain, and many links to modern man from four million years ago are possible. What is not argued, however, is that the evolution of man was an evolution from the neck up, rather than from the neck down. After our transition from the arboreal region of Africa to the terrestrial area of the savanna, our physiology below the neck, for the most part, has not changed. As a result, differences among each hominid are not as distinct as some would hope. In example, the comparison between Australopithecus africanus and Homo erectus can be classified as one of degree, not kind. A. africanus, "the southern ape of Africa," inhabited the Africa region around 2.6 to 2.0 MYA, while Homo erectus, "upright man," encompassed the land around 1.6 to about 1/2 MYA. Despite over one million years of evolution, the differences between the two hominids is limited, and many physical, behavioral, and natural environment adaptations are shared. Instead, a slow, progressive evolution of man is represented between A. africanus and Homo erectus.During the mid-nineteenth century, the great scientist Charles Darwin predicted human evolution to be in Eastern Africa. Sure enough, in 1851 a Dutch anatomist named Eugene Dubois discovered the remains of a hominid at the East African Coast that was classified Homo erectus because of its depiction of bipedalism. Other specimens that represented Homo erectus were excavated in Asia, and the Peking Man for a while, was thought to be the oldest descendant of man (Reader 91). This belief held up for a while until Professor Dart found the first fossil of A. africanus at Taung, South Africa in 1924. This fossil was determined to be about one-million years older than the fossils of Homo erectus. Unlike Homo erectus, however, A. africanus did not move out of Africa. It was only conditioned to survive in the savanna of Southern Africa. On the other hand, remains of Homo erectus have been found in areas of the Old World such as Java, China, Near East, and Northern Africa. How is it that Homo erectus was able to survive the harsh glacier climate of Asia? This question can be answered by examining the physical and behavioral adaptations, most similar but a few important differences, that each hominid endured during its escapade on earth.Even with approximately one million years of evolution, some adaptive physical characteristics between A. africanus and Homo erectus remain the same. There is no projection of bone where the chin would be in either hominid. The brain in both hominids is behind the face and each lack a forehead. This similar characteristic exemplifies the fact that the evolution of man from the neck up was an extremely slow process. In the A. africanus, a clear tendency to the reduction of the jugate (paired) teeth and the growth of the...

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