Members of the ancestral salamander species live in northern California. As they migrate southward, populations are separated by the Central Valley. With limited contact between populations on the east and west of the valley, genetic differences accumulate. What type of speciation occurs under these conditions?

Allopatric speciation

Explanation:

Allopatric speciation is one of the five types of speciation (allopatric, peripatric, parapatric, sympatric and artificial) it happens when a population is geographically separated; for example, when there’s an isthmus splitting an ocean or fruit flies being seperated in the lab. Then the species on each sides of the barrier can no longer mate with each other, and each population evolves separately.

swahili is an extremely rich and complex civilization, a set of ethnic groups articulated by a language and a series of cultural elements that fuse the african traditions, islam and indian culture. this growth was largely a result of the indian ocean trading network that brought in not just man-made riches, but also religious ideas, specifically islam, which had a significant impact on the local culture. furthermore, the development of the swahili language gave a common cultural unity to the people.