Question

what is the result of long - term reproductive isolation? genetic bottleneck hybrid vigor increased gene flow speciation

Explanation:

Reproductive isolation prevents inter - breeding. Over long - term, this leads to populations evolving separately and eventually forming new species, which is speciation. Genetic bottleneck is a reduction in population size, hybrid vigor is the improved characteristics in hybrids, and gene flow is the transfer of genes between populations, none of which are results of long - term reproductive isolation.

Answer:

D. Speciation