Preset trays hold all instruments need in a particular procedure. It is put together in a tub and trays are easily exchanged for other instruments. It is designed to increase efficiency in operations, minimize waiting time and space is reconfigured.
Hide them so they don’t get touched by anyone else and broke
Because they know when they are full and satisfied. They dont have Control over what they eat. But how much they eat.
They may experience irritability and depression because when a person constantly smokes, his/her brain begins to rely on the chemicals it gets from the person smoking, which results in the brain "getting lazy" and not producing the chemicals anymore. If the person were to suddenly quit, the brain would lack in the chemicals it had stopped producing, making the person feel constantly annoyed and depressed because of the chemical imbalance.
My best guess would be D. many studies have linked cardiorespiratory exercise to the lowering of blood pressure. (Many studies have also linked going vegan to the lowering of blood pressure, too :)