The Olmec civilization's economy was based on
the sharing of resources.
trade with other civilizations.
the use of currency to buy goods.
O available resources and bartering.

How does the supremacy clause of the u.s. constitution affect the states? o a. it requires each state to establish a supreme court. b. it declares that the federal government can take away state powers if necessary. o c. it allows state governments to overthrow the federal government if necessary. o d. it ensures that the u.s. constitution overrules each state constitution