How do sharks stay balanced and turn?
There pectoral fins lift them like a plane in the water and sharks like the many kinds of hammerhead use there head for for stearing and quick turns
In both of our ears, there are tubes (I believe they are called Eustachian Tubes) that have a level of fluid in them. They have to stay balanced for you to stay balanced (equilibrium). If the fluid isn't level, if something has caused them to no longer be in balanced, (illness, a blow to the head, spinning around too much, roller coaster, etc.) You lose your equilibrium.