Soil erosion and biodiversity have a two-way relationship. Soil organisms can help prevent soil loss by improving soil structure, but they can also contribute to erosion by disturbing soil stability. Despite this, current soil erosion models do not consider biodiversity. To address this gap, a new factor called the "earthworm factor" was added to a well-known erosion model. This factor reduces soil erodibility and decreases erosion. Additionally, soil erosion can impact soil-living communities, leading to effects like migration, invasion, and defense mechanisms. By incorporating biological factors into erosion models, we can better understand how erosion affects soil life and improve our predictions of soil loss.