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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.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.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.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.The task of discovering the extent and form of prehistoric tools is the focus of archaeology.

Humans live in a culturally conditioned world to such an extent that it can be referred to as a cultural ecological niche.Since the records for prehistoric human existence are found underground, the most fundamental archaeological procedure is excavation--the essence of the archaeological dig. Local residents, farmers, or workers who happen upon prehistoric tools will often alert archaeologists to an area of promise for systematic investigation.Overlying soil is removed, with care being taken to note its natural layers and the exact position of each object and artifact discovered in the process.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.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' (1859), forced the world to face the fact that all the living creatures of the world had almost certainly descended from a common ancestor.