Which one of the following is not a trace element in the human body?
a. fluorine
b. nitrogen
c. zinc
d. manganese
e. iodine.

The human body contains about 2.6% nitrogen. That is way above the percent in the definition of trace elements See:

Let's say a man cuts off a finger accidentally. Based on your knowledge of cells and their membranes what would you do to save it?



what is a trace element?

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