Top Posters
Since Sunday
y
2
s
2
a
1
w
1
w
1
i
1
m
1
s
1
c
1
k
1
1
m
1
Home Q & A Board Biology-Related Homework Help Environmental and Conservation Biology
New Topic  
dracko dracko
wrote...
Go to Answer
Posts: 548
Rep: 12 0
6 years ago
Which of the following is not a source of human-fixed nitrogen?
A) industrially produced fertilizers
B) cultivation of soybeans
C) combustion of fossil fuels
D) irrigation agriculture
Textbook 
Biological Science, Canadian Edition

Biological Science, Canadian Edition


Edition: 2nd
Authors:
Read 56 times
1 Reply
Replies
Answer verified by a subject expert
mastemamastema
wrote...
#1
Top Poster
Posts: 705
Rep: 22 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

dracko Author
wrote...

6 years ago
Brilliant ツ
Mkersey12
wrote...

Yesterday
Thanks
2ne1_12345
wrote...

2 hours ago
Helped a lot
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1117 People Browsing
 182 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 177
  
 237
  
 1552
Your Opinion
Previous poll results: What's your favorite math subject?