Author Question: Trace elements are those required by an organism in only minute quantities. Whic (Read 1648 times)

Hawke

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Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?
A) nitrogen
B) calcium
C) iodine
D) sodium
E) phosphorus




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