Answer
C.
Work Step by Step
Since the nutrient is required for life, it is essential, eliminating B. and D., and since only a small concentration is needed, is is micro, not macro, making A. wrong.
Biology (11th Edition)
by Raven, Peter; Johnson, George; Mason, Kenneth; Losos, Jonathan; Singer, Susan
Published by
McGraw-Hill Education
ISBN 10:
1259188132
ISBN 13:
978-1-25918-813-8
Chapter 38 - Plant Nutrition and Soils - Review Questions - Apply - Page 791: 1
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