Turkey Vultures use their sense of smell to find carrion. Other vultures, like the Black Vulture, rely upon their vision to find food, often locating carrion by watching where other vultures go. ... Some mercaptans smell like rotting cabbage or eggs. They and related chemicals are released as carcasses decompose.
If there is no oxygen , the cells go through anaerobic respiration which leads tot he build of lactic acid in the muscles. This is why we get sore and feel the burn during a workout.