Which of the following statements is not correct?
- every nation-state has a government
- the power of the national government today is strictly limited by international organizations like the league of nations
- almost all land on earth has been divided into nations-states
- all of these statements are correct

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.