Answer: A Swedish naturalist, Carolus Linnaeus also known as father of taxonomy because he developed a way to name and organize species which is still used in modern system of classification. In 1753 he proposed three kingdom system of classification which was published in <span> Systema Naturae. Contributions: His two important contributions were: 1. </span><span>A hierarchical classification system <span> 2. The system of binomial nomenclature. Need of classification: At that time different local names were given to a single species in different languages. So it was difficult for people or scientists to remember the names. He proposed a binomial nomenclature system, in which scientific name was assigned to each organism which was based on species and generic part. It help in identifying an organism by single name through out the world.</span></span>
Nitrogen has a number of important uses. It can be used to replace air and eliminate oxidation of materials. Its most important use is in creating ammonia, which in turn is used to make fertilizer and explosives. Liquid nitrogen is used as a refrigerant for very low temperatures
