Top Posters
Since Sunday
New Topic  
arealhero arealhero
wrote...
Posts: 7874
9 years ago
Oxygen gas (O2) in Earth’s early atmosphere
a. allowed the evolution of anoxic metabolism.
b. depleted ozone in the atmosphere.
c. increased damage to organisms by allowing more ultraviolet light in.
d. allowed organisms to move from the sea to land.
e. was not toxic to most prokaryotes.
Read 521 times
3 Replies
Replies
Answer accepted by topic starter
milestone23milestone23
wrote...
Top Poster
Posts: 9919
9 years ago
Sign in or Sign up in seconds to unlock everything for free
kevtakesoff
Retired master

Related Topics

arealhero Author
wrote...
9 years ago
This is perfect, thank you for the answer.
wrote...
9 years ago
Great!
Retired master
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1296 People Browsing
Related Images
  
 4430
  
 565
  
 386
Your Opinion
Who will win the 2024 president election?
Votes: 3
Closes: November 4

Previous poll results: Who's your favorite biologist?