The anatomical and physiological changes made in acclimatization are usually reversible.
Archaeologists use several methods to assign ages to events of the past.This tool-making technology was a more complex way of making stone tools than the earlier Oldowan technology.More flakes were knocked off from both sides of a stone and there is evidence that the maker had a preconceived notion of the tool's final form.The emergence of man through the process of biological and cultural evolution is a story of long span of time.For the archaeologist and the prehistorian who deals with that long history of man, time is the most important consideration.