Which of the following phrases describes Sam Houston? A. Served as first president of the Republic of Texas

B. Led the Rough Riders in the Battle of San Juan Hill

C. Established the first and largest labor union

D. Designed a steam engine that could run large machines

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.