Someone who rules with absolute authority and power is a dictator.
Yes, humans did exist in the cenzoic era but i don't think they were the first to appear in it
The Manifest Destiny will be your destiny.
Liberty generally allows people to fulfill their goals and personal wishes: this means that there is nothing in the way of people to achieve their goals.
One prize that is connected to liberty is safety: personal liberty applies to everyone, so it also means that other people might be less restrained from hurting us.
They help counteract the uneven distribution of solar radiation reaching Earths surface so if there was no surface current Earths surface temperature would increase to dangerous levels over time.