The root systems of trees in tropical rain forests expand outward from the tree because
A) the ground layer of vegetation in tropical forests is so thick so the roots extract nutrients
from the vegetation.
B) the trees are very short and do not need deep roots.
C) there is a shortage of rainfall in the region tends to prohibit effective plant growth.
D) the mineral content of the soil is shallow and hence roots expand laterally rather than
vertically to exploit the shallow nutrient layer.
E) the ground temperatures in tropical forests are too high to allow for deep roots.
D) the mineral content of the soil is shallow and hence roots expand laterally rather than
vertically to exploit the shallow nutrient layer.
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