In a newly-discovered species of livebearing fish, males have brightly colored, elaborately large dorsal fins. The bright colors attract
predators and the huge fins make it harder to escape predation. (In contrast, females have reasonably-sized fins and drab coloration.)
Which is the best explanation of why the elaborate dorsal fin has evolved in males of this species?
fins.
Males with larger, more colorful fins are more successful at attracting mates, and thus passing on traits that favor these elaborate
This sounds incorrect because traits that negatively affect survival cannot evolve.
Males with such fins have evolved because it was beneficial for the survival of the species.
Strong female-female competition likely favored males' elaborate fins.
