The Most Common Number of Limbs for Life Upon Earth, the Benefit of Being a Tetrapod (Possessing 4 Limbs), and the Sacrifice Which Must Be Made to Evolve the Capability of Flight

Nearly all life on earth has 4 limbs. Having 4 limbs seems to be the most adventitious in respect to survival. When a life form starts to fly, they give up 2 of their limbs which become wings...


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