Based on the map... What obstacle did many of the roads going from east to west have to overcome? Group of answer choices

They had to link many cities

They had to cross the Appalachian Mountains

They had to cross the Mississippi river

They had to cross many cities

d is the answer

i took the

~coco

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.