3. Which of the following is the best example of interdependence? A. More than 120 currencies are used around the world.
B. The United Nations encourages boycotts.
C. Monarchies adopt democratic principles.
D. The World Trade Organization (WTO) works to reduce tariffs.

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.