One danger of excessive nitrogen levels in water is

Two ways Nitrogen can cause harm are through bodies of water by stimulating growth with messes with the ecosystem. The other is that it can be harmful to people as well. It can harm people's bloodstream and in babies that are four months or younger that don't have enough Enzymes to help with the situation... which leads to "Blue Baby Syndrome".

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.