How did humans adapt to the conditions of the last ice age? a. they built permanent dwellings from wood and stone. b. they crossed newly-exposed land bridges to warmer regions. c. they followed migrating animal herds to ensure their food supply. d. they used fire, portable huts, and animal furs to stay warm. e. they settled in caves and waited for warmer temperatures to return.

Why were presidents andrew jackson and martin van buren unwilling to annex texas? a. they did not want texas to be admitted to the union as a slave state. b. they feared that the annexation of texas as a slave state would lead to political problems within the union. c. they thought that texas was too large to be admitted to the union as one state. d. they did not believe in the idea of manifest destiny.