Tags: Type Of Essay Writing In IeltsBibliography For Research PaperFormal Essay HelpCalculus Homework ProblemsCommon App Essay 2014Samples Of Business Plan Pdf
The upper cranium of the skull expanded and assumed a more rounded shape, permitting brain size to increase from about 450 cc to between 8 cc.Other evolutionary trends continued—the protruding jaw receded a bit, teeth became smaller, and height increased.
Barak is no longer just Barak and is no longer just Thrug’s and Amalog’s son.
He is also Gortog’s grandchild, even though Gortog, dead for several years, is a person unknown to the listener.
One of the earliest of the human genera, the Australopithecines, who walked upright and had modified hands, but in many other ways resembled a chimp.
They were small (between 3 and 4 feet tall), had curved fingers, and a skull with a protruding jaw, a recessed cranium, and heavy ridges behind what are now the eyebrows.
The reasons behind the evolutionary increase in brain size are not known, although there is no shortage of speculation.
The need to fashion better tools, the requirements for sophisticated social interaction with conspecifics, the benefits of symbolic thought and language for competition between human groups have all been postulated as reasons for the intelligence of hominids.
Tool use—or at least the evidence of tool use—suggests that it developed into an art.
Spearheads were invented, bone instruments were fashioned to sew, pictorial drawings appear in caves, and some implements show evidence of engraving. The skeleton continued its gracile development and cranium capacity still increased to give its present day range of 1000 to 2000 cc, the average today being somewhere between 13 cc.
Still, we are stuck in the present and must do the best we can with the available data.
Most biologists suspect that humans and chimpanzees split off from a common ancestor as recently as 4 to 5 million years ago. One of the first evolutionary developments that distinguish human ancestors from chimps was upright posture.