I thought this had been explained by how this setup maximizes the efficiency of the respiratory system. This was discussed in a great book I read called Scale:

I thought this had been explained by how this setup maximizes the efficiency of the respiratory system. This was discussed in a great book I read called Scale: https://www.amazon.com/Scale-Universal-Growth-Organisms-Companies/dp/014311090X https://www.amazon.com/Scale-Universal-Growth-Organisms-Comp... the human vascular system follows the same rule iirc.