when members of a population are separated from each other by a physical barrier, causing new species to develop.​

the species could be seperated by many differnt barreirs like a storm that destroys a habitat and the species is split up but this does not mean that a new species would develop.

Explanation:

This is because the only reason new speices would develop is if when they get seperated the species move to a new environment forcing them to adapt.

a and c are the answeres