The BEST description of the way the members of the Society of Jesus (the Jesuits) helped the Counter-Reformation is: They taught about Catholic ideas and set a good example.
As for the second question, one significant impact of the Bubonic Plague on medieval Europe was the drastic reduction of the population, which led to labor shortages, increased wages for workers, and changes in social and economic structures. This also contributed to a decline in the feudal system and a shift towards more modern economic practices.