This answer to your answer is DNA because the genetic code is the set of rules that explains how the information is transferred from DNA to the proteins. Thus, it is carried by DNA molecule in most organisms.
Nitrogen seems to be much difficult for plants to acquire because they can only consume nitrogen when it is combined with oxygen or hydrogen, which is why tropical forests have a lusher plant growth than tundra.
The decomposition process is the secret to maintaining the nitrogen cycle going since the bulk of fixed nitrogen arrives from decaying organisms and faces being broken down by bacteria.
