In this kind of population, the make up of the population's gene pool will remain virtually the same as long as these conditions hold. In this kind of situation, no evolution can take place, all thing will remain the same. For evolution to occur, competition must exist.
The reactants are like a key that fits into the enzyme forming the lock
There are two events,
A: the selection belongs to the specific species, or
A' : the selection does not belong to the specific species.
