A.Coniferous forest
B.Alpine
C.Tundra forest
D.Deciduous forest
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When humus is in soil, the soil will crumble. Air and water move easily through the loose soil, and oxygen can reach the roots of plants. Humus can be produced naturally or through a process called composting. In the category of the deciduous forest, the humus is made up of the dry and dead leaves.
Answer D. Decidous Forests
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