What is the collective term for all the organisms living within the soil?

The collective term for all the organisms living within the soil is "soil biota" or "soil fauna." This includes a diverse range of organisms such as bacteria, fungi, protozoa, earthworms, insects, and other microorganisms. These organisms play crucial roles in nutrient cycling, soil structure formation, and overall ecosystem health. Together, they contribute to the dynamic and complex ecosystem that supports plant life and other forms of biodiversity.