Concept explainers
Level 1: Knowledge/Comprehension
1. 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
(C) the dement 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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