The Symbols +, -, and O Are to Be Used

Multiple Choice

The symbols +, -, and o are to be used to show the results of interactions between individuals and groups of individuals in the examples that follow. The symbol + denotes a positive interaction, - denotes a negative interaction, and o denotes where individuals are not affected by interacting. The first symbol refers to the first organism mentioned.
-The feeding relationships among the species in a community determine the community's

A) secondary succession.
B) ecological niche.
C) species richness.
D) species-area curve.
E) trophic structure.