The document outlines the levels of biological organization from the largest to the smallest scale: the biosphere encompasses all life on Earth and abiotic features, ecosystems consist of biotic communities and their abiotic environment, communities comprise interacting populations, populations are groups of the same species, organisms are single living entities made up of organ systems working together, which are composed of tissues, made of cells working as a unit of structure and function, cells contain molecules such as DNA, and molecules are formed from bonded atoms, the basic units of matter.