known theory of natural selection, we do not doubt that the modern human species, Homo

sapiens, has evolved in a continuum that relates to a primate, which, in a distant past,

constituted the "lost link" between the anthropoid primates and the first hominid

(Tattersall 1995:17-31). Throughout the 20th century, several paleoanthropological

discoveries demonstrated the existence of many species of hominids, such as

Australopithecus, all of which originated in Africa, in a period spanning the last 5.5

million years (Tattersall 1995:41-53). The gradual development of cranial capacity and

brain volume, the appearance of permanent upright position, the invention of tools,

symbolic culture, the control of technologies such as fire and the building of shelters,

hunting and so on become evident due to the archeological remains of hominids, until the

appearance 2 million years ago of Homo habilis and Homo erectus, the first species that

we may consider as human in the modern sense, since they developed complex spoken

language, manufacturing of tools, clothes, fire, cooking and so on (Tattersall and

employment in which to work. This is the world that our ancestors faced, and they had

cm3), conquered all the regions of the Earth by foot, no matter how distant or

Campbell and Loy 2000:206). This defining event in human evolution was followed by

Some topics in this essay:
Campbell Loy, Tattersall Schwartz, Olduvai Gorge, Darwin English, Crude Oldowan, Furthermore Biomechanical, Raymond Dart, China Java, Homo Habilis, bipedal locomotion, homo habilis, campbell loy, homo sapiens, tattersall schwartz, Bechuanland Anatomy, tattersall 199555-105, brain size, kinds tools, campbell loy 2000206-211, loy 2000206-211, discovered taung, arms hands allowed, habilis homo erectus, tools nails screws, bipedal locomotion tool,