Speciation is a two-part process. What reflects the two-part process? 1. Initially identical populations must di- verge but also interbreed to maintain gene flow. 2. Initially identical populationsmust evolve reproductive isolation and then move to dif- ferent habitats. 3. Initially identical populations must mate and maintain reproductive isolating mecha- nisms. 4. Initially identical populations must di- verge and evolve reproductive isolating mech- anisms to remain separate. 5. Initially identical populationsmust evolve mechanisms to diverge and then remain closely related by reproductive isolating mechanisms that fail. .