What reflects the two-part process?

What reflects the two-part process?

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.