Answer
a. The element is required in very small amounts.
Work Step by Step
The word trace refers to a small amount or a "trace amount."
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 2 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 42: 1
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