Radioactive carbon dating is useful for approximately
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.
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.
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.
This was also a million years before the earliest known use of stone tools.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.Prehuman bipeds predated stone tools, which appeared approximately 2.5 million years ago.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.
Their distribution and ways of life are known only from rare discoveries of usually incomplete skeletal remains.