In the mountains and valleys exercise, which of the following parameters had the largest influence on whether the finch population evolved a bimodal distribution? a. the speed at which the model ranb. the difference in carrying capacity between the wet versus dry sides of the islandc. the number of chicks each pair of parents produced each yeard. how far the birds flew when looking for a mate

Option D

Explanation:

The model changed very fast as compared to the time required by finches to evolve. Since finches primarily depend on immigration for reproduction due to this high strength of selection, the finches take long time to evolve. Finches also took longtime to evolve as the change in environment condition was very rapid due to which they could not adapt to it and dispersed the favorable long beak finch to the entire population. Due to higher mate selectivity, the population followed a bimodal distribution.  

Hence, option D is correct