What component of rainforests provides nutrients to the soil and creates living conditions for bacteria and other microorganisms

Rain forest is very favourable place for the trees to grow and for the flora and fauna to develop. The abundant amount of rainfall that these forests get makes them most favoured place for animals and plants to grow.

The bacterial growth in this area is also high because of the canopy of leaves that doesn't allow much of sunlight to cross to the land which makes the bacterial growth prosper and reduction in humus.

The fertility of soil in the type of forest remains due to the type of soil they have which is mostly literate.

is there any options? maybe im just not seeing them but i need the options to

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