Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

Consider likewise the body of man, which must of necessity be composed of different parts, limbs, and organs. The beauty and perfection of the human body require the existence of the ear, the eye, the brain, and even the nails and hair: If man were all brain, eyes, or ears, this would be tantamount to imperfection. So the absence of hair, eyelashes, teeth, and nails is imperfection itself, for even though in comparison with the eyes the latter are insentient and resemble the mineral and the plant, yet their absence in the body of man is most disagreeable and displeasing (32:4)

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