People who survive infection with yersinia pestis during the fourteenth-century european epidemic found themselves immune when reexposed to:

The correct answer is "plague".

Explanation:

The missing options of this question are:

a. influenza

b. plague

c. syphilis

d. pneumonia

e. smallpox.

The correct answer is option b. "plague"

Yersinia pestis is the bacterium responsible for the infamous Black Death, an epidemic that cause millions of deceases in Europe during the fourteenth-century. Black Death left a mark of people in Europe not only in their history, but also in their genome, since several studies have revealed that they immune system respond differently than people in other countries. People who survived Black Death had shown to be immune when reexposed to plague, since the bacterium responsible of plague is Yersinia pestis itself.

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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