You are your body, right? You are chemical in essence ... right? At least, that's what one of America's most influential scientists claims: "I am a collection of water, calcium and organic molecules called Carl Sagan.You are a collection of almost identical molecules with a different collective label." Like Sagan, most people believe that they are their body. So if you ask them who they are, they think and respond in terms of bodily labels.
The physical body is made up of countless numbers of tiny material particles called molecules and atoms. These material particles are constantly being replaced by material particles from the outside environment (in the form of food, water, air, and so on). Over a period of five to seven years, this process of metabolism brings about a complete change of the matter that makes up your body.
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