The estimated global population during the hunting and gathering period was approximately ten million people, based on historical and anthropological studies. This estimate reflects a time when humans lived in small, mobile groups and relied on foraging. Thus, the correct answer to the question is D. ten million .
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The global population during the hunting and gathering period was estimated to be around ten million, significantly influenced by resource availability and human lifestyle. This estimate is widely accepted among historians and anthropologists. The options ten thousand, one hundred thousand, and ten billion are not accurate for this period. ;