It is because of the second taste that mammals can eat and breathe. Obviously, eating and breathing is necessary to maintain mammals' efficient metabolism. Which of the following mammals' findings could attenuate the above assertion? ['Mammals with efficient metabolism and ability to eat and breathe.', 'Mammals with inefficient metabolism and ability to breathe while eating.', 'Mammals with inefficient metabolism but without the ability to eat and breathe.', 'Mammals with high metabolism but no second taste.']