Which 1400s Portuguese invention made travel by sea easier and led to increased Afro-Eurasian trade?

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.

answer; i believe the above statement is (true);

on the whole, dickens has shown the french revolution and its this site might you. good at his job, and the subject matter he chose,