What living organisms are there in the soil?

The soil habitat assumes certain living conditions to which living things must adapt. Such as lack of sunlight, low oxygen content, difficulty moving and others.
But despite this, there are a large number of living beings who have chosen this environment for themselves. These should include bacteria, unicellular organisms, insects, various worms, larvae and even some mammals.
Due to the content of bacteria in the soil, rotting processes take place, which provides the soil with fertility.