A) Little turtle and Blue jacket
It is used to determine the age of an ancient object. The process is called radiocarbon dating. Carbon-14 is a naturally present isotope that is produced when cosmic rays collide with nitrogen and as a result it is oxidized to be become CO2.
The whole amount of currency need to be the same.
There is a higher population in the city than the countryside, which allows for more ideas to be developed and spread
As humans dispersed from the equator peoples skin got lighter and lighter because of fewer exposure to sun radiation.
They didn't get tanned as much :)