What is the actual nature of everyone's body?

SRILA PRABHUPADA SAYS:

Why do we find so many different personalities? If human beings are nothing but combinations of mucus, bile, and air, why are they not identical? 

One man is born a millionaire; another is unable to have two full meals a day, despite struggling very hard. 

Why this difference? Because of the law of karma! Action  and reaction. One who understands this mystery is in knowledge”.

“The Srimad-Bhagavatam (10.84.13) says that this body is nothing but a bag containing three primary elements--mucus, bile, and air--and that one who accepts this combination of mucus, bile, and air as himself is an ass. 

Even great philosophers and scientists take themselves to be this combination of  mucus, bile, and air. This is their mistake. 

Actually, the philosophers and scientists are spirit souls, and according to their karma they are exhibiting their talent. They do not understand the law of karma. 

What Srila Prabhupada comes to say here?

Simple.  All the people are similar in the body.  But, their material status varies according to their karma.