4 The largest single source of nitrogen is in the atmosphere. Nitrogen makes up 78% of our air!
5 It’s a good thing that we have so much nitrogen because every living thing on Earth needs it. But...
6 Most organisms can’t use atmospheric nitrogen (N2) (free nitrogen) Most organisms can’t use atmospheric nitrogen (N2) (free nitrogen). Animals can’t utilize it when they breath. Plants can’t absorb it through their leaves. So...
7 Nitrogen FixationN2 must be “fixed” before it can be used. Fixed- combined with other elements to make compounds. N + H4 = NH4 N + H3 = NH3
8 How is nitrogen fixed?Most fixation is done by bacteria
9 Symbiotic Relationship Bacteria Biological Fixation (where MOST nitrogen fixing is completed) There are two types of “Nitrogen Fixing Bacteria”Free Living BacteriaSymbiotic Relationship Bacteria
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