The vehicles are helpful because it help in transport the things
the vehicles are harmful because it increase the pollution
lion are useful and harmful
It is not harmful. Also it is not useful
The changes talking place in our surroundings and which are useful to us are called Useful changes. The changes which are not useful but harmful are called Harmful changes
i think its both harmful and useful
it is useful
Ozone at ground level is harmful. It is useful in stratosphere as it protects us from harmful UV rays.
It is useful because we can breathe it.
useful for dieing (;
It is USeful
A carbohydrate can be useful or harmful depending on the type that is eaten. Good carbohydrates have fiber in them.
changes both harmful and useful