Biological Science (6th Edition)

Published by Benjamin Cummings
ISBN 10: 0321976495
ISBN 13: 978-0-32197-649-9

Chapter 53 - Ecosystems and Global Ecology - Review - Page 1137: 1

Answer

Atmospheric nitrogen gas is the main global reservoir, as air is comprised of approximately 78% nitrogen. However, this nitrogen is not readily used due to it being diatomic ($N_2$).

Work Step by Step

Atmospheric nitrogen is only usable by organisms once it has been fixed into ammonium by bacteria that lives in soil.
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