The correct answer is b.) All three developed progressively more accurate models of our solar system.
Indeed, Copernicus proposed the heliocentric model, placing the Sun as the center of the universe and not Earth, in the 15th century. Kepler discovered the three scientific laws of planetary orbit around the Sun in the 17th century. Newton created the laws of universal gravitation and motion in the 17th century as well, basing a good deal of his research on Kepler’s work.
Federalism is the system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units.
2. the freezing and frigid tundra is found way up north in parts of Alaska and Canada. That means you would not pass it traveling from Georgia to California
