Flank: a term used to describe the part of the body in humans on the side between the ribs and hip. The term flank is also used to describe the side part of an animal's body.
QUESTION
What percentage of the human body is water? See AnswerFrom 
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References
Rakel RE, Rakel D. "Textbook of Family Medicine." 9th edition. 2015 Saunders.