The basis of the u. s. economy has changed from 1) agriculture to manufacturing to service industries 2)agriculture to transportation to communication 3)agriculture to industry to communication 4) agriculture to industry back to agriculture

When geographers describe how two places are related to each other spatially, they are describing a. where the places are located in relation to one another b. what kinds of natural environments are around each place c. how each place is changing over time d. what kinds of cultures are in each place