At first glance, a human lung and the branches of a tree look surprisingly similar — and that resemblance isn’t just visual. Both follow a branching pattern designed to move gases efficiently. In our lungs, air travels through a network of bronchi and bronchioles that branch into millions of tiny sacs called alveoli, where oxygen enters the bloodstream and carbon dioxide is removed. Trees use a similar branching system to move gases and nutrients through their trunk, branches, and leaves. The connection goes even deeper. Through photosynthesis, trees absorb carbon dioxide from the atmosphere and release oxygen — while humans breathe in oxygen and exhale carbon dioxide.

 

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