Why do anthropologists believe the end of an ice age made migration to washington from asia possible?
a. ice forced nomadic hunters in asia to move to drier lands in washington area
b. the creation of tides from melting ice made it possible to cross from asia during low tide
c. the massive amount of water created a canal that connected asia with south america
d. the melting of glaciers revealed a land bridge from asia to the americas

i think d