No, flies are annoying, they are consider pests.
it is harmful because... if thge flies... will...
birds are vry useful to us (eg) fire flies ,
If you keep it in your house, it will keep away flies.
They have no 'use' other than food for spiders in the food chain.
No one likes flies and bugs insects so SPIDER TO THE RESCUE
Yes, cows have tails. Tails are very useful for swishing flies away.
Fruit flies were useful in Morgan's research for several reasons. They have a short life cycle, making it easier to study multiple generations. They have a small genome that is easy to manipulate and study. They also exhibit a wide variety of genetic traits that can be easily observed and tracked.
The Wolf spider is useful because it eats insects which are known to attack humans, like mosquitoes and biting flies.
well a spider can help by eating flies or like a dragonflies lavae eat mosquito larvae alot of bugs are helpful yet mysterious
Most useful and more useful.
more useful, the most useful
The comparative form of "useful" is "more useful."