Answer: HOPE THIS HELPED! :D ;P
A part of Caesar's legacy are the books he wrote about his military service in Gaul and his actions during the civil war with Pompey. His seven volume series, Commentaries on the Gallic War, provide much of what we know about ancient Gaul and the Celtic people.
Explanation:
Answer: Trade became the vehicle for the spread of religious ideas, technological innovations, disease-bearing germs, and plants and animals to regions far from their places of origin.
Answer: depend on each other for social systems.
Explanation: they need each other for loans and bail-outs.