deadroses4206 deadroses4206 27-01-2022 Biology contestada Select 3 that apply. Why is nitrogen important to all living things? 1:It is a part of amino acids,which help build proteins. 2:It provides the body with the right amount of salt(sodium) levels. 3:It is a part of nucleic acids, which help build DNA. 4:It helps in the purification of water. 5:It is involved in the majority of the energy processes that occur in the cells of organisms.