The answer is
the earth, rock forms, and strata
Instead of using a car, use a bike to help not pollute the air. Recycle water bottles. And use energy-efficient light-bulbs.
It has caused them to both have different temperatures
When two tectonic plates push towards each other, one continental, and another oceanic, the oceanic plate is subducting under the continental plate. This is due to the fact that the oceanic plates's crust is weaker and has lesser density, while the continental is stronger and has bigger density, so when pushing against each other, the weaker, less dense, oceanic plate can not oppose the stronger, more dense, continental plate and slowly subducts under it.
Answer:
I believe that they are decendents of the earliest split from ancient Eurasian populations.