Normally, the body is able to keep the sinuses clean and healthy, despite the dark, moist environment that bacteria love. However, when conditions are right, bacteria can grow out of control in the sinuses, causing a sinus infection. One cause of sinus infections is the common cold.
It has been established that there are two major patterns of human behavior that reflect two modes of brain operation: 1  Survival-Oriented Behavior (SOB). Controlled by primitive areas in the middle of the brain.  Balanced-Empathic Behavior (BEB) .
This article is about the game mode. For the genres, see Survival game and Survival horror. Survival mode is a video game mode in which the player must continue playing for as long as possible in an uninterrupted session while the game presents them with increasingly difficult waves of challenges.