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D is probably right cos you are comparing data
Answer;
The similarity between gills and lungs is that both are sites for gaseous exchange in living organisms.
Explanation;
Gills is a site for gaseous exchange in fishes amphibians at some stage in life; while the lungs is a site of gaseous exchange in mammals and other organisms such as reptiles.
They both serve to bring in oxygen in the living things body and the eliminate carbon dioxide from the body; process of gaseous exchange.
However, they differ in a number of ways; for example, lungs are internal while gills are external , lungs are developed to breath in oxygen from the air, while gills are developed to get oxygen from water.
The correct answer among the choices provided is option C. Water helps to maintain the structure, flexibility and motion of proteins. Hydration makes the protein structure more packed and stabilized. It is because water is included in many networks of hydrogen bonds.
C i am guessing but i hope this helps