One difference between the technology of the plano and that of the clovis and the folsom is that the plano

The differences were precisely is that they developed a variety of stone points especially in the use of spear points. The one used by the technology of the plane was different from the launching point of clovis technology since those of the flat culture lacked the groove that did possess the spear point of the clovis culture. The Folsom spear points present a different slit as well, which is of great benefit, since the towing towards the center of the spear were markedly improved.

d) iowa i believe is the answer

rescuing someone who is in danger. hope this : )