What was the role of the conductors of the underground railroad?

The folsom culture was replaced by the plano culture. clovis culture. american indian culture. paleo-indian culture.

Which of the following could affect the human population? a hurricane makes landfall on an uninhabited island.a deadly virus emerges that can pass from human to human.a civil war breaks out in italy.a solar eclipse occurs.

How did the environments in north america affect the development of america indian cultures in the period just before europeans arrived