WORLDCLIC IS THE PROCESS OF OXIDIZING FOOD MOLECULES LIKE GLUCOSE TO CARBON DIOXIDE (C02) AND WATER (H2O).IT MAKES ENERGY FROM SUGAR,RESPIRATION NEEDS OXYGEN TO OCCUR,IT TAKES PLACE IN THE MITOCONDRIA AS THE POWER HOUSE OF THE CELL.IT CONSIST OF THREE PHASES AS FOLLOW. (1)GLYCOLYSIS-THAT START WITH GLUCOSE AND WITH PYRUVIC ACID, ITS PRODUCT IS 2ATP-2NADH. (2) PYRUVIC ACID IS MODOFIED AND BROUGHT INSIDE OF MITOCONDRIA WHERE THE REST OF CELLULAR RESPIRATION OCCURS THE CITRIC ACID CYCLE IS A REPEATED PROCESS.