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  We   need food  to keep  us alive.What happens  to that food  inside our body? The process from  the moment  the food enter the mouth until  it mixes  into blood stream is called  digestion.Digestion  usually  takes up  to 18 hours.There are about  8 meters  of tubes and chambers inside our body that process  the food eaten by us.It consist of organs that  help in chewing ,swallowing,breakdown and absorption   of food as well as expulsion  from the body of what is left afer  the process.In  the mouth the  tongue and teeth  helps   in  breaking of food  .Then  this  bolus  is transferred  to the stomach after we swallow  it. Gastric juce in  the  stomach  ,is rich  in  hydrocloric  acid  and the protein-spilitting  enzyme  pepsin.Then  food reaches Duodenum through  a muscular   valve.The   pancreatic juce contains  enzymes for splitting  carbohydrate,protein and fat  in  the  food.Bile  a bitter liquid  in the liver  also   help  in this process.This  useful  digeste

  Bacteria   are   the   most   plentiful   living  organism   on  the  Earth.They   are  the  most  smallest    organism ,each  consisting   of  a   simple ,  single  cell.A   few   types  of  bacteria ,called  germs ,cause  diseases    in  humans .But   most  bacteria     are   harmless,  some  are   very  useful.They   used  in  making  drugs   and  foods. Bacteria    reproduce   by  binary   fission(splitting  in  two). Reproduction    by     division   means  that  bacteria  can   multiply  very  quickly,if  the  conditions   are  just   right.Bacteria   comes  in  three   shapes- Cocci,called  coccus    are  sp herical Bacilli, called  a  bacillus    are  rod  shaped. Spirilla,one  is  called  a  spirillum  are  spiral   shaped. First   bacteria   appear more  than   900  millions  years  after    Earth   formed.Dutch  scientist   Antoni  van  Leeuwenhoek   was  the  first  person    to  see  bacteria  ,  in  scrapping  of  his  teeth   in  1683.F