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It is stressed in the passage that, during the Upper Palaeolithic Era, ----.
The Stone Age is, in fact, divided into various stages.
Dominating the period is the Palaeolithic Age, which most
anthropologists would extend down to roughly 11,000
B.C. Within the Stone Age in general, however, scholars
also speak of an Upper Palaeolithic Era, beginning around
40,000 B.C. They draw attention to some significant
changes in human behaviour around this date, including
the appearance of sophisticated cave paintings, and
evidence of religious ideas. Humans also began
producing the most effective, finely crafted tools such as
fishhooks, arrowheads, and sewing needles made from
organic materials, such as wood or animal bone. Yet,
despite these important developments, the basic patterns
of human life changed little during this era. Virtually all
human societies before 11,000 B.C. consisted of small
bands of hunter-gatherers that moved incessantly in
search of food. Because they could not stay in any one
location for long, these groups left no continuous
archaeological record whereby we might trace the
development of their culture. Our knowledge of them is,
therefore, very limited.