Most of the nitrogen on Earth is in the atmosphere. Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.Click to see full answer. Consequently, how do different organisms make use of nitrogen?Nitrogen is required by plants to produce proteins, DNA, RNA, ATP, NAD+, NADP+, Chlorophyll etc. Nitrogen fixation describes the conversion of nitrogen into nitrate, a form that can be used by plants. This is carried out by volcanic action, lightning, industrial activity and by some bacteria.Secondly, how do organisms use nitrogen quizlet? Once bacteria in the roots of plants have “fixed” the nitrogen, the nitrogen can be used by organisms to build proteins and other complex substances. Plants absorb the nitrogen. Animals eat the plants. Decomposers break down these complex compounds in animal waste and in the bodies of dead organisms. Besides, why is nitrogen important to living things? Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms.How do we get nitrogen in our body?The most common form of nitrogen in your body is proteins containing mainly carbon, hydrogen, oxygen and nitrogen. While neither humans nor animals can get nitrogen into their bodies from the air or soil, they do gain nitrogen from vegetation or other animals which eat vegetation.