The dead and decayed plants turn to coal after a million years under high pressure and heat of the earth.
And the petroleum is formed the same but with the dead animals in ocean bed to form petroleum
A, because of evolution things are constantly changing. DNA is written with letters and we are nearly identical but yet a few chromosomes make up our differences, but everyone has the possibility of a bad bacterial causing a DNA change which completely changes our reading
The answer to your question is,
Epidemiology
-Mabel <3
I believe the force is called diffusion.
