Answer
90%
Work Step by Step
It is estimated that about 90% of Nitrogen used by living organisms is created through nitrogen fixation.
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 20, Viruses and Prokaryotes - 20.2 - Prokaryotes - 20.2 Assessment - Page 585: 3b
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