What is the primary source of uncertainty over the limits on presidential power? a.)some presidents win their elections by greater margins than others. b.)constitutional amendments have greatly increased presidential powers. c.)the constitutional definition of executive powers is broad and unspecific. d.) some presidents increase power in times of need..

What happened as agriculture became entrenched in the south ?

What important discovery was made by edmond halley and alexis clairaut, using newton's ideas of mathematics and gravity? they created the scientific method to outline how science should be conducted. they were able to find the orbit of a comet and predict the year of its return. they discovered the three newest planets--uranus, neptune, and pluto. they explained why objects appear to have color.

Abigail adams rescued important items from the white house, including a portrait of abraham lincoln, during the war of 1812. a. false b. true