Nitrogen can be changed by lightning into a form so can use it.

Living organisms can use it.

The nitrogen cycle is the process by which nitrogen is converted from organic to inorganic forms; many steps are performed by microbes

The nucleic acid and proteins of each class of  viruses   assemble themselves into a structure called a nucleoprotein, or nucleocapsid. the protein and nucleic acid constituents have properties unique for each class of  virus; when assembled, they
determine   the size and  shape   of the  virus   for that specific class.
hope i ^-^