How did the Wangarans know when the caravans wanted to make an offer to trade

Beating drums

Explanation:

How was the system of silent barter a major advantage to the wangarans it helped guard their secret location of gold mines

just finished this it is b. centrifugal force

the correct answer that would best complete the given statement above would be option b. expanding civil services. diocletian and constantine paved the way for foreign invasion by dividing the empire, creating administrative bureaucracies and reorganizing the military, except for expanding civil services. hope this answer .

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explanation: