Approximately what percentage of the adult human body is water?

Question

BlackTom AI · Accepted Answer

When considering the composition of the adult human body, water content is a key figure in physiology. 
Option 1: '40%' is too low; while some tissues (like bones) have relatively lower water content, the overall body water percentage is well above this value.
Option 2: '60%' aligns with the commonly cited estimate that about six-tenths of body mass is water; this figure reflects the average across adults, accounting for variations in age and sex.
Option 3: '80%' would overstate the water content; most tissues are not that high in water, and several elements (such as bone mineral) reduce the average percentage.
Option 4: '20%' is clearly beneath typical estimates; it would indicate a drastically low body water content, inconsistent with standard physiology data.
In sum, the other three options diverge from the established range for adult body water percentage, while the second option sits at the widely accepted value used in medical and educational contexts.

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