Which of the Following Statements About Species, as Defined by the Biological

Multiple Choice

Which of the following statements about species, as defined by the biological species concept, is (are) correct?
I. Biological species are defined by reproductive isolation.
II. Biological species are the models used for grouping extinct forms of life.
III. The biological species is the largest unit of population in which successful interbreeding is possible.

A) I and II
B) I and III
C) II and III
D) I, II, and III