    “Sentence: 1: How did scientists ‘assess the (DNA/RNA  of yersinia pestis?    Sentence 2:.ends" the ‘debate about the etiology of   “the” Black "Death, and ‘unambiguously demonstrates:  that .Y:" pestis “was: thie causative -agent-“of the  epidemic. plague: thai*devastated “Eurépe during ‘the  ‘Middle Ages’ :