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?
O He is studying oxygen, which can also be found in proteins.
He is studying oxygen, which is the most abundant element in the atmosphere.
He is studying nitrogen, which can also be found in proteins.
O He is studying nitrogen, which is the most abundant element in the atmosphere.