Gene flow
-evens out genetic differences between populations
-increases genetic differences between populations
-happens when random events change the genotype of a population
-is the same as genetic drift

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.