What might happen if the population of mice and rabbits grows very low?

If the populations of mice and rabbits decline significantly, it could disrupt local ecosystems, as both species serve as important prey for various predators. This decline may lead to an increase in the populations of their predators, which could eventually face food shortages if their prey does not recover. Additionally, plant communities that rely on herbivory for balance may become overgrown, potentially altering the habitat and affecting other species. Overall, the interconnected dynamics of the ecosystem would be impacted, leading to unforeseen consequences.