How do consumers differ from other groups

What kind os source would a historian use to get a firsthand account of a past event

Plz how did the jews of the diaspora preserve their heritage?

Which answer best describes an advantage of shipping goods by canal? a) most towns would rather have canals then noisy railroads b) goods could travel very fast downstream in the canal system c) traveling by boat is a much more relaxing way to transport goods. d) heavy loads of goods could travel by boat more easily then if pulled by horses.