Read this: Hunting-gathering was the common human mode of subsistence throughout the Paleolithic, but the observation of current-day hunters and gatherers does not necessarily reflect Paleolithic societies; the hunter-gatherer cultures examined today have had much contact with modern civilization and do not represent "pristine" conditions found in uncontacted peoples.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): How do modern hunters and gathers differ from early ones?
contact with modern civilization