The element X that is labeled in the diagram, and found abundant in the human body, is oxygen. The correct option is D.
What is oxygen?
Oxygen is a chemical element. It is a gas, and it is found at 21% in the atmosphere. It is the most important gas because all animals required oxygen to breathe and live.
Our body is made up of water and water is made up of hydrogen and oxygen, so oxygen will be present in large amounts.
Thus, the correct option is D. Oxygen.
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