<span>Modifier is something that affects the structure or
function of an organism. Because modifier refers as modification, which means
any changes of modification has done to change the state or structure of a
certain organism or object.
For example:
=> Your dentist put braces to your teeth to make your teeth straighter. (
your teeth has been modified )
=> Your plastic surgeon did nose life to you ( your nose has been modified )
If something changes on a state of a matter, meaning it was being modified</span>
Nitrogen is essential to the engird cycle of plants and bacteria. without it they would die. The nitrogen in the air is not in it's biological form, its N2 (abiotic). So the diatomic nitrogen goes through the nitrogen cycle and converted into <span>NH3 or NH4+ its biological form (biotic)</span>