After settlers migrated to north america, resources were used to establish housing and farm and grazing lands. which resource was reduced because it was in the way, rather than because it was necessary for progress?
forest
coal
grassland
water

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

answer; ///i believe its: ///(embolus);