Nature is very efficient.  Good designs, no waste.  The purpose of the gallbladder is to store a small repository of bile, which serves many important functions.  Bile requires a good deal of energy and biological resources to produce in the body.  It is vigorously recycled.  It is what makes the color of a healthy stool dark brown.  The main purpose of bile is to break down fat into absorbable components, namely essential fatty acids. 

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