Which of the following factors was the most important change that guided the shift from Paleo-Indian cultures to Archaic Indian cultures?

As the Ice Age ended, the climate became warmer and drier, changing habitats and reducing the large game that Paleo-Indian groups had hunted. Archaic cultures adapted by relying on a wider range of plants and animals and developing new ways to obtain food. Thus, climate change was the most important guiding factor; farming was not yet the main basis of life.

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