Answer:
Addition of voles from a larger population will help increase the genetic diversity and combat inbreeding depression.
The voles of the rare population did not have much genetic diversity. Addition of voles from the larger population will allow the rare voles to breed with the ten voles from the larger population. As a result, genetic diversity will be produced.
Inbreeding depression refers to a decreased fitness level in species due to inbreeding. Addition of the ten voles from a larger population will allow more choices for breeding.