Ecologists Often Build Models to Depict the Relationships Between Organisms

Multiple Choice

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,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)