× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
7
6
o
5
b
4
s
3
j
3
b
3
m
3
K
3
g
3
L
3
w
3
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
krystian krystian
wrote...
Go to Answer
Posts: 530
Rep: 0 0
6 years ago
The accumulation of free oxygen in the atmosphere
  a. was a result of the accumulation of a by-product
  of a type of photosynthesis.
  b. prevented the further spontaneous generation of
  life.
  c. provided the opportunity to extract more energy
  through aerobic respiration.
  d. did not occur immediately after the earth was
  formed.
  e. did all of these.

Question 2

The by-product of the metabolism of cyanobacteria
  that had the most effect on the further evolution of
  life is
  a. oxygen gas.
  b. carbon dioxide.
  c. water.
  d. nitrogen gas.
  e. hydrogen gas.
Read 69 times
2 Replies
Replies
Answer verified by a subject expert
noah.ratliffnoah.ratliff
wrote...
#1
Posts: 325
Rep: 0 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

krystian Author
wrote...
#2
6 years ago
Now I'm convinced to ask more questions Slight Smile
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1073 People Browsing
 101 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 254
  
 529
  
 287
Your Opinion
How often do you eat-out per week?
Votes: 81
Previous poll results: What's your favorite math subject?