One of the functions of cholesterol is regulating the fluidity of the plasma membrane of cells. Many species of cold-water fish have low levels of cholesterol. How might such species maintain the fluidity of their membranes

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis