Q: What is it called when two groups of individuals from the same species become separated for many generations and can no longer breed?

What is it called when two groups of individuals from the same species become separated for many generations and can no longer breed?

Flexi Says: Speciation is the process by which new species evolve from existing populations. Speciation occurs when two populations of organisms become isolated and members of one population no longer mate with members of the other population. The genetic makeup of the two populations diverges over time in response to environmental pressures and random mutations. Eventually, the two populations become separate species.