The question is incomplete as the group of choices are not provided however the correct group of choices are given as follows:
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.
He is studying nitrogen, which is the most abundant element in the atmosphere.
Answer:
The correct answer is - He is studying oxygen, which can also be found in proteins.
Step-by-step explanation:
Human body is comprises of various type of molecules and elements such as fats, protein, carbohydrates and many other elements. Carbohydrates and fatty acids are are made up of 3 major elements carbon, hydrogen and oxygen.
Oxygen is an essential element with 65% of all elements found in human body it shows great affinity with proteins. Oxygen binds with hemoglobin then transferred to the through out the body. The oxygen is also one of the elements found in proteins with other elements like nitrogen, hydrogen and carbon.
Thus, the correct answer is - He is studying oxygen, which can also be found in proteins.