Hii. My name is Aiman I will tell you about the answer all natural process we intake the food hy chewing and ingulf through osephagus the tube that directly connected with stomach after go through many digestive enzymes like lypase fractase maltase sliva which is presented in our mouth is also enzyme which speed up the chemical reaction hy lowering the activation energy picture down below show you the cells which take the food hy oxidation method 
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