Top Posters
Since Sunday
w
3
w
3
e
3
3
r
3
b
2
M
2
V
2
f
2
c
2
c
2
K
2
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
bgoodwi1 bgoodwi1
wrote...
Go to Answer
Posts: 311
Rep: 1 0
6 years ago
What was the probable role of oxygen gas in the early stages of life's appearance on Earth?
A) Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life-forms.
B) Oxygen promoted the formation of complex organic molecules through physical processes.
C) Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth.
D) Abundant atmospheric oxygen would have created an ozone layer, which blocked out ultraviolet light and thereby protected the earliest life-forms.
Textbook 
Campbell Biology: Concepts and Connections

Campbell Biology: Concepts and Connections


Edition: 8th
Authors:
Read 33 times
1 Reply
Replies
Answer verified by a subject expert
Lexis2018Lexis2018
wrote...
#1
Posts: 188
Rep: 177 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here

Related Topics

bgoodwi1 Author
wrote...

6 years ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
Tabitha.davis
wrote...

Yesterday
Thanks for your help!!
Hellish Lover
wrote...

2 hours ago
Just got PERFECT on my quiz
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  497 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 596
  
 1680
  
 871
Your Opinion
How often do you eat-out per week?
Votes: 81
Previous poll results: Who's your favorite biologist?