What is the difference between a dominant and recessive trait? how are each trait's symbolozed?

The difference between a dominant trait and a recessive trait is that the dominant trait must have one copy of each from two different parent
Example: Brown Hair=H
Light hair=h
Hh is dominant because this is of a copy of each from two parents
A recessive trait must have two same copies coming from the same two parents
Example: HH

Because the carnivores keep the herbivore population in check