Which of the following is a trace element required only in Small amounts by most living things
A. Oxygen
B. Iron
C. Nitrogen
D. Hydrogen
A. Oxygen
B. Iron
C. Nitrogen
D. Hydrogen
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Correct Answer – b
Iron is component of haemoglobin of RBC of blood and helps in transportation of oxygen (about97-99%) as well as carabon dioxide (about23%)