In the term trace element, the adjective trace means that
a. the element is required in very small amounts.
b. the element can be used as a label to trace atoms through an organism’s metabolism.
c. the element is very rare on Earth.
d. the element enhances health but is not essential for the organism’s long-term survival.
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Master Atoms- Smallest Unit of Matter with a bite sized video explanation from Jason Amores Sumpter