Which of the following is not a reason the plague (black death) was able to spread in cities?
a. people carried the fleas to infect each other as they traded goods and services.
b. the dirty streets provided a food source for rats, which carried the plague.
c. cats were revered, and each family had several of them to eat rats around the house.

the dust bowl, otherwise known as the dirty thirties, was a huge dust storm that killed multiple (and i mean  multiple) farmer's crops, leaving them homeless, and foodless, and jobless. in california, there were 5.7 million residents, and the population shrank as mexicans were repatriated. however, when the dustbowl happened, a lot of people began to move to california. by 1940, 250,000 people had arrived. therefore, your answer would be  the population increased, massively.  i hope this !

explanation:

the answer is b. hope this !