Which of the following statements best describes the process of how later Paleo-Indian cultures replaced earlier ones?

Later Paleo-Indian cultures are generally understood as developing gradually from earlier groups as people adjusted to changing environments and resources. They adapted their ways of life, including developing new tools and habits. This makes “Over time, groups adapted to changing conditions and developed new tools and habits” the best description; the other choices imply complete replacement or extinction without explaining this gradual change.

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