Sovereign nation-states have the ability to complete all of the following activities except:
a. conduct day-to-day business
b. enter into agreements with other nations
c. set trade policies with other nations
d. freely invade other nations

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.