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If you are not familiar with biology, the concept to understand how the body works is quite simple. First, the human body has different biological functions VS its structure. “Using italic words as a comparison” (Ancient Egyptian society has different hierarchical classes of people and they all occupied different roles and functions in a society). Here is a list of decreasing biological order in a human body: organism level, organ system level, organelle level, molecular …

…a fast train, which transports people faster) (A protein is like the ensemble of different wagons (different amino acids) of a whole train) (Each wagon (each amino acid) is connected by a Or similar to a peptide bond in an amino acid. Finally, both carboxyl and amino end groups of the amino acid is like different end (or motor head) of a train. ------------------------------------------------------------------------ **Bibliography** Thanks to my biology teacher Paul Anderson about his comments...