What would NOT be found at the base of a big tree in a tropical rain forest? 

A)  a deep, vertical taproot 
B)  roots that spread out through the nutrient-poor, moist, thin soil layer 
C)  a thick supportive tree trunk 
D)  a shallow root system

Taproot

The main central root from which other roots sprout laterally, typically found in many plants and trees, providing anchorage and nutrient absorption.

Nutrient-poor

Environments or substances that lack sufficient quantities of essential nutrients needed to support robust plant or animal growth and health.

Root System

The component of a plant that anchors it to the ground, absorbs water and nutrients, and stores food.