b.The hybrid offspring have greater biological fitness than their parents
Biological fitness is defined as the number of offsprings the parents can produce in a given time. Basically it can be interpreted as, the more the number of offsprings produced by a parent, the greater is its biological fitness and vice versa.
In the question hybrid population is being produced as a result of disappearance of geographic barrier.
a. If the hybrid offspring have less biological fitness than their parents, the hybrids will decline over a period of time and the genetically isolated offsprings will be more.
b. If the hybrid offspring have greater biological fitnes than their parents, then the hybrid population will increase over a period of time and the parental population will decrease.
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