Why are there so many different species of honeycreeper living on the Hawaiian Islands?

a. Predators and diseases caused populations to separate.

b. Varying climates among the islands have resulted in different species.

c. Separation of populations has led to the evolution of new species.

d. The different honeycreepers arrived from other islands in the Pacific at different times.

separation of populations has led to the evolution of new species

Explanation:

When the populations evolve to become distinct species, then this process is termed as speciation. Speciation can occur due to various reasons and one of these reasons is geographic isolation that leads to separation fo the populations which then faces different evolutionary pressure and thus evolve into new species. In the Hawaiin islands, there are different species of honeycreepers because of the unique geology of Hawaii due to which new volcanic islands are constantly being formed and eroded which leads to the separation of population and their evolution into new species.