Pleas help What is the concept in which each branch has its on role/responsibility?
A. Checks and Balances
B. Separation of Powers
C. Legislation
D. Executive Branch

Federal courts have jurisdiction when a case involves what?

Ascientist who studies prehistoric and historic people by analyzing artifacts is a(n) a. historian b. botanist c. archaeologist d. anthropologist

The persian wars started when emperor darius i began an invasion of greece. what caused darius to decide to attack greece? a. greek pirates had raided persia's merchant ships and coastal towns. b. greek armies had attacked and taken over land that belonged to persia. c. greek city-states had supported rebellions in the persian empire. d. greek leaders had declared independence from the persian empire.