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The parliamentary system.
Commission Plan
QUESTION: WHAT WAS THE FIRST FORM OF OUR NATIONAL GOVERNMENT? =ANSWER: ARTICLES OF CONFEDERATION=
mayor-council
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A complex question, to complex for this form There is a good description of their government on WIKI pedia
The plural form IS functions. The singular form is function.
The Greek city-state was the one and only form of government, carrying out all the functions of government, rather than having three levels.
Legislative branch makes law; Executive branch (president) executes laws.
The US is a country not a government. Similarly Rome is a city not a government. Your question therefore makes no sense.When asking question please make sure that you questions are answerable.
The President can not exercise any judicial powers. He is the head of the Executive Branch of Government and not a member of the Judicial Branch.