Using large animals greatly improved the ability of people to . (farm/gather)

farm

Explanation:

Agricultural developments came to help civilization to focus on other things that weren´t as basic as food resources and allowed humans to develop science and trade, the use of large animals made easier the job that farming requiered and made it easier for people to work on the fields, lowering the number of workers requiered per farm.

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.