Wild rodents are the major reservoir of the plague organism, yersinia pestis, but pandemic plagues were historically associated with crowded, unsanitary urban areas. why is this the case?

Yersinia pestis can be transmitted by fleas from wild rodents to urban rats, which quickly die of the disease. Humans are accidental hosts due to fleas seeking out blood meals after most rats have succumbed to the disease.

Explanation:

it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

(e) a major consequence of the election was that several southern states