Biological organization refers to the hierarchical structure of living organisms, ranging from simple to complex forms. It starts with the smallest unit, the cell, which is the basic building block of life. Cells group together to form tissues, which then combine to create organs. These organs work together in organ systems to support the overall function of an organism. At a higher level, multiple organisms of the same species form a population, while different populations interact within a community. These communities, along with their physical environment, make up an ecosystem. Understanding these levels helps scientists study life and its interactions.