Arrange the following sentences to form a coherent paragraph:
- The study suggests that the disease did not spread with such intensity, but that it may have driven human migrations across Europe and Asia.
- The oldest sample came from an individual who lived in southeast Russia about $5,000$ years ago.
- The ages of the skeletons correspond to a time of mass exodus from today's Russia and Ukraine into Western Europe and central Asia, suggesting that a pandemic could have driven these migrations.
- In the analysis of fragments of DNA from $101$ Bronze Age skeletons for sequences from Yersinia pestis, the bacterium that causes the disease, seven tested positive.
- DNA from Bronze Age human skeletons indicate that the black plague could have emerged as early as $3,000$ BCE, long before the epidemic that swept through Europe in the mid-$1300$s.
- $51432$
- $12543$
- $54123$
- $32415$