× Didn't find what you were looking for? Ask a question
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 Biology-Related Homework Help General Biology
New Topic  
madisonraynor_ madisonraynor_
wrote...
Go to Answer
Posts: 507
Rep: 0 0
6 years ago
Which type of microscope would be used to observe structures on the surface of an individual cell?
 
  a. LM
  b. TEM
  c. SEM

Question 2

Oxygen built up in the atmosphere approximately 2 billion years ago and
 
  a. occurred due to carbon dioxide being split by lightning strikes.
  b. could not have occurred without the oxygen coming from outer space.
  c. destroyed ozone forming more oxygen.
  d. helped to form the ozone layer that is so important to life today.
  e. occurred because aerobic organisms required the oxygen.
Read 54 times
2 Replies
Replies
Answer verified by a subject expert
LakajLakaj
wrote...
#1
Top Poster
Posts: 567
Rep: 1 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

wrote...
#2
6 years ago
I wanna give this person a hug.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1227 People Browsing
 125 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 222
  
 1032
  
 935
Your Opinion
What's your favorite math subject?
Votes: 293
Previous poll results: What's your favorite coffee beverage?