What played an important role in the spread of both roman catholicism and orthodox christianity?

An important role in the spread of Christianity, both Catholic and Orthodox, is the Monasticism. It is believed that the "father of monasticism" was Antony the Great, who lived in the desert, by the ascetic way of life. although there were many before him. The characteristic of the monastic way of life is asceticism, prayer, in the aspiration to attain the gospel of values, according to the rules of early Christianity. Those who live this way of life are known as monks-men and nuns-women.

1920's

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explanation:

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.