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
Yes, nitrogen dioxide is harmful. It is a pollutant which is toxic if inhaled.
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
Nitrogen is an element, it does not separate smaller than nitrogen atoms, unless you consider subatomic particles to be useful,
it is useful
Around 80% of air we breath is nitrogen.
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.