The end of the feudal systems that defined the European Middle Ages was
primarily caused by "<span>(C) the emergence of trade and a middle class of merchants," since this created more opportunities for people to "break free" from the land-holding system. </span>
<span>Sand dunes can encroach on human habitats. Sand dunes move through a few different means, all of them assisted by wind. One way that dunes can move is through saltation, where sand particles skip along the ground like a rock thrown across a pond might skip across the water's surface. When these skipping particles land, they may knock into other particles and cause them to skip as well. With slightly stronger winds, particles collide in mid-air, causing sheet flows. In a major dust storm, dunes may move tens of meters through such sheet flows. And like snow, sand avalanches, falling down the steep slopes of the dunes that face away from the winds, also moving the dunes forward.
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The answer would be B) These inventions led to increased business productivity and economic growth
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