What is one effect of rainfall on mosquito populations?

Rainfall significantly impacts mosquito populations by creating standing water, which is essential for their breeding cycle. Mosquitoes lay their eggs in or near water, and when rainfall occurs, it fills containers, puddles, and low-lying areas, transforming them into suitable breeding grounds. The presence of water is crucial because mosquito larvae develop in aquatic environments. Therefore, an increase in rainfall can lead to a rise in mosquito populations as more breeding sites become available.

While some may think that heavy rain reduces mosquito populations, this is typically short-lived because although adult mosquitoes may be temporarily washed away, the creation of new standing water fosters breeding soon after the rain stops. This cycle directly contradicts the idea that rainfall does not affect breeding or that dry weather is more favorable. Thus, the correct answer reflects the critical role that rain plays in supporting larval development through the provision of necessary water sources.