which one is mighter brain or the brawn ? Give reasons for your answer.

I would argue that the brain is mightier than brawn, on the basis that the brain is consistently working and developing throughout one's entire life. One may have brawn and be in great physical shape for the majority of one's life, but this level of fitness will eventually deteriorate as one ages. The brain is much better capable of remaining sharp and "in shape", so it is generally more useful. In addition, a study has proven that the body naturally prioritizes its energy consumption for the brain over other parts of the body, like muscles and organs.