If you will answer wil get the branliest. which best explains how rivers affected the interaction between prehistoric groups? they protected groups from invasion. they invited interaction with other regions. they kept groups separate most of the time. they let groups divide and form unique cultures.

They invited interaction with other regions.

Explanation:

In general, when various civilizations settle along a particular river, this leads them to have interaction and even cultural exchange with one another. This is because water is a necessary resource for all people. Therefore, it is likely that several groups would desire to be close to this resource. Moreover, rivers tend to be effective as a means of transportation, allowing people to reach faraway areas more easily and quickly than when travelling over land.

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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