The largest cell in the middle acts as the service provider of the entire animal since it is the most conductive cell in the animal.Therefore, the largest cell in the middle is the brain of the animal.


Now why being the most conductive cell of the animal makes it the service provider and the brain of the animal?

Lets look at the picture below.

The metal bar in the middle acts as the middleman helping the magnet attract the paper clip. In this case, the metal bar is the service provider.

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If a cell in the animal needs to attract new chemicals, it can attract new chemicals through the largest, most conductive cell in the middle. The largest cell in the middle acts as a middleman attracting chemicals from outside for its surrounding cells.