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.
Brainliest for best answer.

This is a 2017 topographic map of puerto rico in the united states, and i'm sorry that people there have suffered such a disaster. i want to ask, what do the yellow dots and areas represent on this graph? and the blue area and the little blue circle, and the little blue sign that looks like a signal tower, what do they stand for?