Top Ten Powerful Nations 2013 (According to Global Presence). Top Ten Powerful Countries Ranking (2012). NOTE: National Power Index (NPI) 2012 is a comprehensively revised version of the previous National Security Indexes published in Indiaâs National Security Annual Review (INSAR) series since 2002.op Ten Powerful Nations 2013 (According to Global Presence). Top Ten Powerful Countries Ranking (2012). NOTE: National Power Index (NPI) 2012 is a comprehensively revised version of the previous National Security Indexes published in Indiaâs National Security Annual Review (INSAR) series since 2002.
Overview. When you take in food, it's the job of your digestive tract to break that food down into smaller pieces through mechanical digestion, and then break larger molecules into smaller ones through chemical digestion.
Found This Helpful. Chemical digestion occurs when acids, enzymes and other secretions break down the food we eat into nutrients. Chemical digestion starts in the mouth and continues in the stomach, but most of the process occurs in the small intestine.hemical digestion breaks down carbohydrates, proteins and fats into sugars, amino acids and fatty acids that the body can absorb and use as fuel.