Which of the following statements about house flies is true?

House flies are non-biting insects commonly found in and around homes, which aligns with the selected answer. Their primary habitats include areas where food is present, as they are attracted to decaying organic matter, waste, and other food sources. This behavior makes them a common sight in urban environments, particularly in warmer months.

House flies play a significant role in the ecosystem, acting as scavengers. However, they do not bite or feed on blood, which is characteristic of biting flies. Instead, they can cause health issues due to their role in transmitting pathogens, as they can pick up bacteria and viruses on their bodies and transfer them to food and surfaces.

Other statements do not accurately describe house flies. They do not breed in clean, sterile environments; instead, they prefer areas with organic waste. They also do not have a long lifespan; typically, house flies live for about a month under ideal conditions. Understanding these characteristics is essential for effective pest management and for recognizing the potential health risks they can pose.