When earthworms add their wastes to the soil then die and decay this contributes to?

When earthworms add their wastes to the soil and subsequently die and decay, they contribute to soil fertility by enhancing its organic matter content. Their waste, known as castings, is rich in nutrients such as nitrogen, phosphorus, and potassium, which are essential for plant growth. Additionally, the decay process of their bodies improves soil structure and promotes microbial activity, further enriching the soil ecosystem. This overall contribution supports healthier plant growth and improves soil health.