【单选题】There are exceptions to the rule of male insects being smaller than the females, and some of these exceptions are intelligible. Size and strength would be an advantage to the males which fight for the...
A.
male insects are always smaller than females
B.
in a given species nature provides differences between sexes to insure successful reproduction
C.
size and strength protect females from other females
D.
longevity is characteristic of the Dynastes and Megasoma