The factor that contributed most significantly to the differences among Texas American Indian cultures is the —

d. geography of the region in which they lived

Explanation:

Texas has different geographical landscapes from the deserts west Texas to the coastal plains in the east. The geography of these regions led the Native Americans occupying them to adapt to their environment the best they could.

The Atakapa and the Karankawa for instance stayed in the coastal plains and adapted by fishing, hunting and foraging for roots by the coast. They also came up with ways to fend off the mosquitoes there.

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