Which term describes the collective regions where life interacts with the physical world?

The term that best describes the collective regions where life interacts with the physical world is "biosphere." The biosphere encompasses all ecosystems on Earth, including land (terrestrial), water (aquatic), and even the atmosphere, where living organisms interact with various physical elements like air, water, soil, and climate.

In this context, the biosphere represents the global sum of all ecosystems and highlights the complex interactions between living organisms (plants, animals, microorganisms) and their physical environment, which is essential for supporting life.

While "ecosystem" refers to a specific community of living organisms interacting with their environment within a particular area, it does not encompass the entire range of life and interactions occurring on Earth. "Habitat" indicates the specific place or environment where an organism lives and grows, and "biome" classifies large geographical areas that share similar climate conditions and ecosystems, but neither captures the entirety of life’s interactions with the physical world like the term biosphere does.