Expand the role of earthworms in soil formation and fertility.

Earthworms increase soil fertility, improving its water and air regime, which contributes to plant nutrition. Due to the secretion of mucus, earthworms are able to change the acidity level of the soil. In the process of their vital activity, the worms mix the components of the soil, contributing to an increase in the uniformity of the soil, and convert the organic matter of the soil into forms that are assimilated by plants and other inhabitants of the soil.