Le Chatlelier’s principle states that if a system at equilibrium is subjected to any change, the system will adjust itself to counteract the applied change. There are a number of factors that ...

At equilibrium, the concentrations of reactants and products do not change. But the forward and reverse reactions have not stopped - they are still going on, and at the same rate as each other.

The Hardy-Weinberg equilibrium is a principle stating that the genetic variation in a population will remain constant from one generation to the next in the absence of disturbing factors.