Convergent evolution is the process where distantly related organisms independently evolve similar traits for adapting similar necessities.
Example : Sharks and dolphins
Biogeography is the study of distribution of species and eco systems in geographic space through geological time
Comparitive biochemistry is the study of differences and similarities in physiological or biological processes among the living organisms.
Analogous structures are the one similar in function which do not derive from a common ancestral feature in different species.
Example: Fins in fish and penguins.
So, the correct option is Biogeography
