Closely related species often look similar but have courtship rituals that are slightly different.

a. increase competition between the species

b. increase communication between the species

c. ensure that mating occurs between member of the same species

d. promote the evolution of new species through inter breeding

Closely related species often look similar but have courtship rituals that are slightly different to ensure that mating occurs between member of the same species. The correct option among all the options that are given in the question is the third option or option "c". This is to preserve the specialties that each species have.