In the soil, dead plants and animal tissues are converted them into dark colored substance known as

In the soil, dead plants and animals tissues are converted them into dark colored substance known as humus.

Humus is found in the topmost layer of the soil called topsoil. Decomposers convert these dead plants and animals into humus. They are the micro-organisms present in soil. Humus is essential to make the soil fertile. The organic remains of dead animals and plants are broken down into simpler nutrient form and released into the soil, from which its absorbed by the roots of the living plants to grow healthily.