Role of bipedalism in homo sapiens

Features compared are the braincase shape, foreheadbrowridgenasal boneprojectioncheek bone angulationchin and occipital contour The cranium lacks a pronounced occipital bun in the neck, a bulge that anchored considerable neck muscles in Neanderthals.

Role of bipedalism in homo sapiens

Subsequently Diogenes the Cynic, in an equally flippant fashion, displayed a plucked chicken and declared, "Here is Plato's man. In his work on biology, he avoided the effort to treat biological entities by the use of rigid formal logic, and, though he made some inevitable errors in fact, his pragmatic approach has served as a model for biological observation ever since.

From long before the time of the ancient Greeks, human beings were generally recognized as members of the animal world. Much later, in the middle of the 19th century, Charles Darwin, in his brilliant book 'On the Origin of Species by Means of Natural Selection'forced the world to face the fact that all the living creatures of the world had almost certainly descended from a common ancestor.

He further developed that view in his work 'The Descent of Man'in which he specifically stated that humankind ultimately shared a common origin with the rest of animate nature.

At the time when Darwin was writing, there was only the most rudimentary sort of a fossil record to support his view, and he was further hindered by the use of the term man to stand for the human species as a whole. As that word suggests, there was a tendency to conceive of males as typifying the human condition.

Obviously, females are of equal importance to the survival of the human species, and, somewhat belatedly, the field of biological anthropology has come to realize that males and females require equal attention if the phenomenon of humankind and how it emerged from its nonhuman predecessors is ever to be understood.

It came as something of a surprise when scientists determined that human beings share almost 99 percent of their genetic material with chimpanzees. This led one scientific journalist to refer to humans as "the third chimpanzee. Human feet have lost their grasping capabilities and clearly reflect the fact that humans are characteristically bipedal while chimpanzees and all of their other relatives are characteristically quadrupedal as well as being more clearly adapted to tree-climbing as part of their normal way of life.

Humans also lack the fur coat that all other primates possess, and, relative to body size, human brains are nearly three times as large as those of the apes.

Finally, all human groups are completely dependent on the use of language, without which they could not survive, and there is nothing comparable among their nearest nonhuman kin. The learning of previous generations is passed on by linguistic means, and new insights and experiences by individuals can become the property of the group as a whole when these are verbally transmitted.

This clearly is a key to human survival, and it is a uniquely human attribute.

The Evolution of Early Man

That body of verbally transmitted learning and traditions is referred to as culture. Humans live in a culturally conditioned world to such an extent that it can be referred to as a cultural ecological niche. This is the arena in which the survival of the human species is played out.

The occupants of the cultural ecological niche impose a series of selective pressures on each other as they use language and other aspects of culture to their advantage. In general, those who have trouble learning the rudiments of language will have less chance for survival.

The cultural ecological niche puts a premium on those portions of the brain associated with linguistic capability. One would expect, then, that the evidence for the increasing complexity of the prehistoric cultural record would be linked to an increase in brain size of the associated prehistoric hominids.

This is indeed the case. Researchers can assess brain size and the form of limbs and feet of prehistoric specimens to see what they can tell us about the course of human development. It is much less easy, however, to tell such things as whether or not the prehistoric creatures in question had lost their fur coatings yet or whether they had developed the capacity for articulate speech.

The soft tissues of the body do not generally survive the process of decomposition. Although the archaeological and anatomical record does provide us with some indirect clues by which the answers to such questions can be suggested, those answers are only tentative.

Evidence from East African fossils indicates that erect-walking bipedalism began at least 3. This was also a million years before the earliest known use of stone tools.

Role of bipedalism in homo sapiens

At the same time, however, the canine teeth had ceased to project above the level of the other members of the tooth row the way they do in virtually all nonhuman relatives. This may indicate that the canine teeth were no longer being used for defensive or aggressive purposes and that they were being replaced in this capacity by handheld implements made of perishable materials.

Even though actual tools have not been discovered, it seems unlikely that a relatively slow-moving terrestrial biped lacking defensively enlarged canine teeth could have survived without them. Their distribution and ways of life are known only from rare discoveries of usually incomplete skeletal remains.

In most instances, their discovery was the work of paleontologists as a somewhat incidental by-product of their efforts at recovering the much more abundant skeletal remains of various kinds of prehistoric mammals see Skeleton.

Stone tools, however, do not dissolve and disappear the way bones often do. After their makers had discarded them, they continued to exist as witnesses to the activities of the early hominids--a term used for creatures that are more than just apes and which includes everything from prehuman bipeds up to contemporary human beings.

Actual hominid skeletal remains are quite rare, but once stone tools begin to appear in the archaeological record, the areas occupied by toolmakers can be traced through the time writing begins and prehistory proper comes to an end.() Australopithecus interbred with Homo sapiens?

[Anyway, they definitely are half Australopithecus, which dates from - 7 million years ago. Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or animal or machine that usually moves in a bipedal manner is known as a biped / ˈ b aɪ p ɛ d /, meaning "two feet" (from the Latin bis for "double" and pes for "foot").

Types of bipedal movement include walking, running, or hopping.. Few modern species are habitual bipeds whose. The table below presents an abbreviated geologic time scale, with times and events germane to this essay.

Please refer to a complete geologic time scale when this one seems inadequate. In taxonomy, Homo sapiens is the only extant human species. The name is Latin for "wise man" and was introduced in by Carl Linnaeus (who is himself also the type specimen).Extinct species of the genus Homo include Homo erectus, extant during roughly to million years ago, and a number of other species (by some authors considered subspecies of either H.

sapiens or H. erectus). INTRODUCTION. Bipedalism is an essential adaptation of the Hominin progeny that is considered the major force behind several skeletal changes shared by all the bipedal hominins (Lovejoy ).There are different hypotheses that explain how and why bipedalism evolved in humans.

Homo sapiens, (Latin: “wise man”) the species to which all modern human beings belong. Homo sapiens is one of several species grouped into the genus Homo, but it is the only one that is not extinct.

See also human evolution.. The name Homo sapiens was applied in by the father of modern biological classification (see taxonomy), Carolus had long been known that human beings.

Role of bipedalism in homo sapiens
Human evolution - Wikipedia