Ecologists often build models to depict the relationships between organisms.In such models,an arrow is used to link two organisms in a relationship.The arrowhead is next to the organism that is affected.If the effect is positive,the arrow is labeled with (+) ,and if negative,then the label is (-) .Which of the following models best illustrates the relationship of the Brazil nut tree and the other organisms associated with it?
A) 
B) 
C) 
D) 
Correct Answer:
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