Which of the following situations might require voters to hold a special election?
a.
a citizen announces that he or she is interested in running for office.
b.
a regularly scheduled election day is approaching.
c.
a state governor resigns from office partway through his or her term.
d.
a president reaches the end of his or her term.

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.