Answer:
<h2> Indus people settled</h2>
I Am Almost Positive That The Answer Is C
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The answer is B. It caused economic and social instability by drastically reducing the workforce. the Black Death was caused by rats carrying diseases which in turn got humans and animals sick, and when the people got sick they couldnt work which reduced the workforce.
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I think the answer is the Silk Road but I'm not sure.
afarensis had both ape and human characteristics: members of this species had apelike face proportions (a flat nose, a strongly projecting lower jaw) and braincase (with a small brain, usually less than 500 cubic centimeters -- about 1/3 the size of a modern human brain)