Why did disease spread so easily in industrial revolution cities

In the overcrowded tenements of the industrial cities, one infected person could spread the disease very easily. Though accurate records are difficult to acquire, it is believed that TB killed one-third of all those who died in Britain between 1800 and 1850. Microbes were only discovered in 1864 by Louis Pasteur.

Explanation:

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because there were many people and there were some among them that had deseases and they kept spreading

Explanation:

biological/genetic factors means they were born or predisposed to have something. nothing can really change it, and you can't really do much to "fix" it. it isn't something learned

these are the biological factors:

adrian is relatively tall and he is on the basketball team

(adrian can't ever stop being tall or force himself to be tall. likely one or both of his parents are tall as well and they passed on the tall gene. he probably does basketball because he is tall)

the rest are environmental/cultural factors. these are things that are taught to us. for example, cynthia wasn't born saving pocket money, her family most likely taught her this (environmental factor)

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