Question

what bacterium caused the black death?*
streptococcus pneumoniae
yersinia pestis
escherichia coli
salmonella typhi
which of the following was not a contributing factor to the spread of the black death?* 1 point
poor sanitation
limited medical knowledge
growing trade networks
advanced vaccination programs

Explanation:

The Black Death was caused by the bacterium Yersinia pestis. Poor sanitation, limited medical knowledge, and growing trade networks all contributed to its spread. Advanced vaccination programs did not exist during the time of the Black - Death, so they could not have been a contributing factor to its spread.

Answer:

1. B. Yersinia pestis
2. D. Advanced vaccination programs