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The EGR system routes a number of the exhaust gases (6 ? 10%) through the EGR valve, back in for the Intake System, and finally inside combustion chamber. The exhaust gases are inert i.e. they do not burn inside the combustion chamber; also, the exhaust gases occupy a few of the space which may otherwise be taken from the intake air. This cuts down on level of intake air readily available for the combustion process during each Power Stroke; which often decreases the peak combustion temperatures. This ends in lower NOx emissions. In early embryonic development, an oversight can take place giving the embryo some cells with two X chromosomes and several with three X chromosomes. Luckily, both types of cells continues to divide and since not every cells have the abnormal amount of X chromosomes the female is only going to experience mild, if any, symptoms. The study of geology also encompasses Earth processes which can affect overall civilization. An earthquake can destroy a large number of lives in a few minutes. Also, tsunamis, floods, landslides, droughts, and volcanic activity may have an enormous influence on civilization. Geologists study those processes and can recommend action plans to minimize damage in the event that such events will occur. For example, by studying flood patterns of rivers, geologists can recommend areas to stop when building new cities,towns, and residential neighborhoods in order to prevent future damage. Earthquake science, although a very difficult division of study, might help minimize problems for life and civilization by estimating where earthquakes are likely to occur (referred to as fault lines) also to recommend the technology to use within the construction of buildings over these vulnerable areas. 1. The attractiveness of the person People with an anxiety disorder often have co-occurring mental health problems, such as depression, and this can increase serious risks like suicide. Often severe anxiety disorder symptoms and panic attacks are a warning sign and increase the risk of suicide.