Read e-book online Early Humans - The Pleistocene & Holocene Epochs PDF

By Thom Holmes

This paintings lines the beginnings of the human species, its good fortune and flexibility, and the advance of such strategies as human language and tradition.

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The massiveness of the jaw and the front teeth in some apes results in a jutting forward of the jaw called prognathism. In some apes, the jaw muscles are massive and required the development of a sagittal crest along the top of the skull to accommodate muscle attachment. In contrast to that of apes, the human dental battery has smaller front teeth and greatly reduced canines that have lost the shearing action found in apes. in37 37 10/30/08 8:39:41 AM 38 EARLY HUMANS cusps. Molars in archaic humans are very large, heavily enameled, and adapted for the grinding of many kinds of foods; they become reduced in size and less heavily enameled in modern humans.

Indd 42 11/12/08 4:45:54 PM Early Hominins and the Emergence of the Genus Homo 43 a male and which from a female, so each study (as well as those by earlier researchers) based its assessment on some other morphological character of the arm bones that may or may not be due to sexual dimorphism. Even though their results disagree somewhat, each of these studies shows a trend in hominin evolution toward less extreme size differences in many physical features of male and female hominins when compared with some great apes such as gorillas.

27 Archaic H. 52 H. 04 Modern H. 27 Sources: Aiello and Dean (1990), Kappelman (1996), and Holloway (1999). Note: Estimated EQs are not derived using all the specimens included in the second column. in40 40 10/30/08 8:39:44 AM Early Hominins and the Emergence of the Genus Homo 41 An australopithecine skull however, paleoanthropologists look for anatomical differences between specimens that might be attributed to gender differences. In the great apes, sexual dimorphism generally is exhibited as differences in body size between males and females.

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