Nitrogen is extremely helpful to plants because it is a vital nutrient they need. When nitrogen enters the blood steam of a human or animal, it can cause decompression sickness. On the whole, life would not be possible without nitrogen.
It is both because it helps us to breath but it can also stop us from breathing.
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
useful
i think its both harmful and 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
changes both harmful and useful
A carbohydrate can be useful or harmful depending on the type that is eaten. Good carbohydrates have fiber in them.