Question

what is a special about a forest floor

Answer 1

forest floors have more life then you can imagine. You don't know when you're going to step on a stealthy snake and armies of ants are always marching past your feet. The rotting leaves on the floor keep producing endless amounts of humus, keeping the soil fertile.
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Answer 2

The forest floor does not contains any waste material. The dry leaves, dead animals etc. are decomposed by natural action of rain, etc. This thing is special about the forest that they did not contain any waste material.