How did rivers affect the interaction between prehistoric groups?

a. they protected groups from invasion.
b. they invited interaction with other regions.
c. they kept groups separate most of the time.
d. they let groups divide and form unique cultures.

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gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.