Final answer:
The biosphere is the most inclusive level of biological organization, encompassing all ecosystems and forms of life on Earth.
Step-by-step explanation:
The level of biological organization most inclusive of life-forms is the biosphere. This level includes all ecosystems, where living organisms interact with each other and with the abiotic components of their environment. The hierarchy of biological organization ranges from the most inclusive levels to less inclusive ones and is typically represented as follows: biosphere, ecosystems, communities, populations, organisms, organ systems, organs, tissues, cells, organelles, molecules, and atoms.