Barnacles are a type of arthropod in the subphylum crustacea, and are related to crabs and lobsters. barnacles are exclusively marine, tend to live in shallow and tidal waters, or attached to larger organisms. barnacles are sessile; that means they do not move about. the image shows barnacles attached to the tail of a humpback whale. in this relationship, the barnacles derive benefit. there is not benefit or harm to the whale. this relationship is an example of

a) commensalism.
b) competition.
c) mutualism.
d) predation.