The model of speciation that requires some time with geographic barriers between two populations, allowing evolution of reproductive isolation, isa) allopatric speciation. b) phyletic gradualism. c) sympatric speciation. d) punctuated equilibrium. e) prezygotic isolation.

The answer is a) allopatric speciation.

Explanation:

Allopatric speciation happens when a geographical or physical barrier is introduced in a population. After this, the reproductive isolation, genetic recombination and also random mutations can promote the speciation process, where at the end, there will be two separate species.