Plague is an infectious disease caused by bacteria called Yersinia pestis. They are found mainly in rodents, particularly rats, and in the fleas that feed on them.
So the Answer is Animals
Answer:
It allowed land-grant colleges to perform experiments in the fields of rural farms.
Explanation:
Geographers run into problems with maps because they don't know the how to solve the map problem, how they can solve the problem is by watching the stray and the lines on it so that they can notify it and it won't be a problem for them that do the maps
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