A classification system is a system with a distribution of classes created according to common relations.
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Taxonomy is the science of defining and naming groups of biological organisms on the basis of shared characteristics.
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The main molecule found in nucleus is called DNA(deoxyribonucleic acid). This molecule is made of subunits called nucleotides. A nucleotide is made of a nitrogenous base that can be adenine, thymine, guanine or cytosine; a five carbon sugar called deoxyribose and a phosphate group. This molecule controns protein synthesis. Proteins are crucial to the cell's function.