The correct term for extreme non-plant life contained in the soil is "soil microbiota" or "soil microorganisms." Soil microbiota refers to the diverse community of microorganisms such as bacteria, fungi, archaea, and other microscopic organisms that inhabit the soil. These microorganisms play crucial roles in soil health, nutrient cycling, and decomposition processes. In extreme environments, you may also encounter specific terms like "extremophiles" to describe microorganisms that thrive in extreme conditions, such as extreme temperatures, high salinity, or low pH levels.