Which element of the federal government best reflects the constitutional
principle of the separation of powers?

Legislative branch because the Legislative branch form important parts of most governments; in the separation of powers model, they are often contrasted with the executive and judicial branches of government

Hope this helps

--Jay

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b