Without any information i would say the industrial revolution and the pollution that occured because of it
An introvert is likely to stay inside and read all day. Compared to extroverts*, introverts are people who are less outgoing and sometimes prefer solitude than engaging with others.
Unfortunately, no. However, the sooner you start studying, the easier it will be to study, so you will be more prepared for the exams.
I wish you the best of luck
You don’t need specific numbers for econ
There were settlement houses run by sympathetic people and churches that helped house and feed the poor. Also, political bosses would help the poor get jobs and such in return for their votes.