What were the purposes of the earthworks built by cultures of eastern north america? select all that apply. a. astronomical observatories b. burial mounds c. defensive structures d. fields for athletic competition e. temple platforms

it allows shippers to carry commercial goods, which allows them to save time and money.

the geography of greece

led to limited interactions with other cultures in the mediterranean

was rich in natural resources and led to repeated invasions from the macedonians

encouraged greater contact with peoples on the southern and eastern mediterranean coasts

caused the greeks to eventually relocate eastward under alexander the great