There are three major survival systems or meters in place here: hunger, thirst, and oxygen. (cheatcc.com)
The game has such an in - depth survival system, forcing you to plan your journey or face death. (quillstreak.com)
«The evidence is clear that the passion of romantic love is a goal - oriented motivation state, not a specific emotion,» Fisher tells WebMD, adding that the results showed that romantic rejection is a form of addiction, and those coping with these hurtful feelings are fighting uphill battle against a strong survival system. (webmd.com)