<span>Kepler's laws of motion helped overturn the earlier Aristotelian astronomical system which believed that the sun and planets revolved around the Earth. In order for the older system to work, a complicated mechanism known as "epicycles" was required to make the visible motions match the theory.</span>
Answer:
Fertile River Valleys
Explanation:
The Indus River Valley Civilization and Mesopotamia were all centralized on these fertile river valley because it allowed food to easily grow so they had excess food, bringing more people in.