Which of the Following Would Be Most Significant in Understanding

Multiple Choice

Which of the following would be most significant in understanding the structure of an ecological community?
I. determining how many species are present overall
II. determining which particular species are present
III. determining the kinds of interactions that occur among organisms of different species
IV. determining the relative abundance of species

A) only I and III
B) only II and IV
C) only I, II, and III
D) only II, III, and IV
E) I, II, III, and IV