Final answer:
A classification system in biology organizes living organisms into a hierarchy based on their attributes, ranging from organism to biosphere, and down to the level of molecules, tissues, and organs.
Step-by-step explanation:
A classification system is a list that organizes resources and associates them with their characteristics. In biology, this refers to the way in which living organisms are organized and catalogued according to their various attributes and relationships to one another. Organisms can be categorized in a number of hierarchical structures, typically starting from the broadest category going to the most specific, such as from organism to community, then to biosphere, and further down to molecule, tissue, and organ.