Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 38 - Plant Nutrition and Soils - Review Questions - Apply: 1

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.
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