A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65% of human body mass. Which statement describes the element he is studying?
Answer
H
He is studying oxygen, which can also be found in proteins.
H
He is studying oxygen, which is the most abundant element in the atmosphere.
H
He is studying nitrogen, which can also be found in proteins.
H
He is studying nitrogen, which is the most abundant element in the atmosphere.