Campbell Biology (11th Edition)

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

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."
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