Top Posters
Since Sunday
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
r
4
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
Tbreland05 Tbreland05
wrote...
Go to Answer
Posts: 328
Rep: 0 0
5 years ago
Nearly all of the oxygen in the Earth's atmosphere was originally produced by photosynthesis in the leaves of trees that covered the continents 3.5 billion years ago.
A) True
B) False
Textbook 
The Essential Cosmic Perspective

The Essential Cosmic Perspective


Edition: 7th
Authors:
Read 115 times
1 Reply
Replies
Answer verified by a subject expert
tray5tray5
wrote...
#1
Posts: 189
Rep: 162 0
5 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

Tbreland05 Author
wrote...

5 years ago
Thanks
mkyoungs
wrote...

Yesterday
This site is awesome
SlimyPencil
wrote...

2 hours ago
Good timing, thanks!
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1158 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 3553
  
 997
  
 744
Your Opinion
Who's your favorite biologist?
Votes: 586
Previous poll results: What's your favorite funny biology word?