Sharks, just like any other fish, develops gills to breath underwater. Their gills, act like a filter to filter out the oxygen with the water.
I believe that McCarthy was exposed for being a fraud. Hearings were broadcasted that showed how he intimidated witnesses and had asked abrupt questions. Interviews that had basically took away our basic civil rights.
I think it is 20 just look at the time it is two and a half hours and horses do oeuvres are very small