Despite the fact that the Black Death was widespread and deadly,

it seemed that some Europeans were immune to it.

it was not understood how it started or how it spread.

it did not affect most countries in western Europe.

it seemed that many doctors did not attempt to treat it.

it was not understood how it started or how it spread.

Explanation:

The Black death, otherwise known as Pestilence or Great Bubonic Plague amongst many other names, caused about 75 - 200 million deaths across Europe and Asia in the 14th century. At the time, doctors did not understand the cause or spread of Black death disease, so they relied heavily on treating the disease in an orthodox or traditional way.

Not until French biologist, Alexandre Yersin, discovered the cause and spread of the disease in the late 19th century, which he described as bacillus, named Yersina pestis.

And it is spread through air, or bite of infected flea and rats. It is mostly spread from human to another human, which is why it spreads quickly in the 14th century across Eurasia or Europe and Asia.

b.) it was not understood how it started or how it spread

Explanation:

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