The battle at gettysburg is remembered, at least in part, because

There are no written records of the first migration of humans to the americas? true or false

What would be considered a secondary source about the assasination of abraham lincoln

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.