What fraction of the human body is comprised of water?

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Multiple Choice

What fraction of the human body is comprised of water?

Explanation:
The main idea here is how much of the body’s weight is water. In a typical adult, total body water is about 60% of body weight, reflecting the water content of lean tissues like muscles and organs; fat tissue holds less water. Because of that, the closest option is approximately one half. The other statements don’t fit for an average adult: less than a quarter is far too little, more than two thirds is too high, and exactly three quarters is also higher than usual. For contrast, infants have a higher proportion—around 75–78%—which helps remember that water content can vary with age and body composition.

The main idea here is how much of the body’s weight is water. In a typical adult, total body water is about 60% of body weight, reflecting the water content of lean tissues like muscles and organs; fat tissue holds less water. Because of that, the closest option is approximately one half. The other statements don’t fit for an average adult: less than a quarter is far too little, more than two thirds is too high, and exactly three quarters is also higher than usual. For contrast, infants have a higher proportion—around 75–78%—which helps remember that water content can vary with age and body composition.

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