B. Pax Mongolica. In Pax Mongolica, there is relative peace that happened after Kublai Khan was killed. Resulting to this, the re-opening of Silk Road gave way to transfer to culture, tradition, and trades, and religion.
They protected the Western & Atlantic railroad which was confederate general Joseph E. Johnston’s supply link to Atlanta
An example of a theory is Evolution, we don't really know 100% how we came to be as we are now, but we do know that 1+1=2 as a fact, same with gravity, we Know it exists because it's what ties us to earth and we can "feel" it, but not Evolution, Evolution is a theory, just like the BingBang
Newton’s first law of motion
If the forces acting on an object are balanced then the resultant force of an object is zero
Newton’s second law of motion
The acceleration of an object is directly proportional to the force as force=mass*acceleration
E.g the higher the resultant force the more the acceleration
Newton’s third law of motion
When two objects interact with each other they exert equal and opposite forces on each other.