Final answer:
The biosphere is the largest and most inclusive level in the biological hierarchy, encompassing all areas on Earth that support life, including land, water, and atmosphere.
Step-by-step explanation:
The level of biological hierarchy that is the largest and most inclusive, referring to anywhere in, on, and around Earth where life can exist, is the biosphere. This encompasses all the land, water, and air that support life, and includes areas from the depths of the oceans to the upper atmosphere. Since the biosphere contains all the regions of Earth where living things are found, it integrates all living beings and their relationships with the lithosphere, hydrosphere, and atmosphere, making it the most comprehensive level of ecological organization.