What characteristic defines a mosquito that has many generations a year and prefers water with organic material?

The characteristic that defines a mosquito with many generations a year and a preference for water with organic material is exemplified by the House mosquito, scientifically known as Culex pipiens. This species thrives in urban environments and is often found in stagnant water that is rich in organic matter, which provides the necessary nutrients for the developing larvae. The ability to complete multiple generations in a year allows Culex pipiens to adapt quickly to environmental changes and increases its population density, which, in turn, raises concerns regarding disease transmission.

This preference for organic-rich water sources is critical for their life cycle, facilitating adequate conditions for larval development and survival. While other mosquito species may have distinctive habitat preferences or life cycles, the specific combination of rapid reproduction and affinity for organic material sets the House mosquito apart, aligning it closely with the criteria mentioned in the question.