(D) The roles of feathers in birds are as follows:$(a)$ They create an airfoil shape for the wings,which provides lift during flight.$(b)$ They help i

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(D) The roles of feathers in birds are as follows:$(a)$ They create an airfoil shape for the wings,which provides lift during flight.$(b)$ They help in maintaining body temperature by providing insulation.$(c)$ They play an important role in mating displays and sexual selection.