Why did Indians of the Southwest culture group develop irrigation techniques while the Indians of the Columbia Plateau culture group did not?
The Indians of the Southwest lived in an arid region, while the Columbia Plateau region received abundant rainfall.
The Indians of the Southwest culture group learned irrigation techniques from the Indians living on the Great Plains.
O The Indians of the Southwest culture group lived in a region that received abundant precipitation
O The Indians of the Columbia Plateau culture groups were not as advanced as those living in the Southwest.