What would happen to the number voles if the amount of grass increased?

If the amount of grass increased, the population of voles would likely rise as well. Grass serves as a primary food source for voles, so an abundance of it would provide them with more resources to feed on, leading to improved survival and reproduction rates. Additionally, increased vegetation could offer more shelter from predators, further supporting population growth. However, this could also attract more predators, potentially balancing the vole population over time.