What are house flies environment?

Fruit flies, sometimes called gnats, are tiny insects that are often found buzzing around a bowl of fresh fruit. Scientists find fruit flies useful to study because some of their genes are very similar to those of humans. The fruit fly is highly susceptible to environmental factors, the genetic effects of which can be seen over the course of a few generations in fruit flies, since they reproduce, age, and pass on so much more quickly than other organisms.