Answer is A.
it is the definition
Answer:
Scientists concluded that the average human body contains approximately 37.2 trillion cells
Explanation:
C is going to be your answer
Answer and Explanation:
The federal government of the United States (U.S. federal government) is the national government of the United States, a federal republic in North America, composed of 50 states, a federal district, five major self-governing territories and several island possessions.
Federation
Presidential system
Liberal democracy
Federal republic
Constitutional republic
United States/Government
In 1846 a dispute over the border between texas and mexico resulted in armed conflict and the mexican-american war began