Both Gills and Lungs are involved in respiration so the answer would not be A. Gills and Lungs both exchange gases. They take in oxygen and release carbon dioxide. Resulting in the elimination of answer choice B. Gills do not have a reproductive role, so the answer is not C. FInally, D would be the right answer choice. Gills do not function outside water while lungs function out of the water. Therefore, the correct answer is D.
