A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65 percent of human body mass. Which statement describes the element he is studying?

Oxygen makes up about 65 percent of human body mass and is found in fats and carbohydrates. It is also present in proteins, so the statement that he is studying oxygen, which can also be found in proteins, is correct. Nitrogen is the most abundant gas in the atmosphere, but it does not make up 65 percent of human body mass.

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