23. Speciation

Which of the following statements are true regarding recontact in hybrid zones?

I. Stable hybrid zones result in the two species fusing into one.

II. Reinforcement strengthens prezygotic barriers, limiting the creation of hybrids.

III.Hybrid zones are created when species are found in sympatry and lack pre- or postzygotic reproductive barriers.

Regular hybridization, resulting in hybrid organisms with low fitness, could lead to natural selection favoring what outcome?