Biology

The correct answer is: D.Allopatrically, after the ancestral species has split into two populations.

Explanation:

When two different species evolve from a single ancestral species, allopatric speciation is one of the most common mechanisms. This occurs when a population becomes geographically isolated (due to factors like the formation of a river, mountain range, or other barriers), and over time, the two isolated populations evolve independently due to different environmental pressures, genetic drift, or natural selection. These differences eventually lead to the formation of two distinct species.

1.Allopatric speciation is driven by geographic i...