Tropical rainforest canopies are generally
A) a two-layer canopy that is thickest in its upper layer and thinnest in its lower layer.
B) a two-layer canopy that is thickest in its lower layer and thinnest in its upper layer.
C) a three-layer canopy that is thickest at the ground level.
D) a three-layer canopy that is thickest in its middle layer.
E) a one-layer canopy.
D
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