1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lakkis [162]
3 years ago
5

When did cyanobacteria start producing pure oxygen?

Geography
2 answers:
densk [106]3 years ago
0 0

Answer:

b

Explanation:

MissTica3 years ago
0 0

<u>Answer:</u>

<em>Cyanobacteria started producing pure oxtgen </em>

<em>A. After the Hadean eon </em>

<u>Explanation:</u>

<em>Cyanobacteria, otherwise called Cyanophyta,</em> are a phylum of microscopic organisms and plastids that acquire their vitality through photosynthesis. They are the main photosynthetic prokaryotes ready to deliver oxygen.

<em>The name cyanobacteria originates from the shade of the microorganisms. Cyanobacteria started producing pure oxygen after the Hadean eon.</em>

You might be interested in
Which of the following is NOT a branch of natural science?
balu736 [363]

The correct answer is; D. social science

Social science is NOT a branch of natural science.

Social science is the study of society, the relationship among people in a society and how the behavior of people influences the society. Social science is not a branch of natural science. Social science covers a wide range of disciplines such as economics, psychology, management and business studies, sociology, political science, communication studies and linguistics.


7 0
3 years ago
Read 2 more answers
Is exploitation needed? Why or why not​
kaheart [24]

Answer:

no, it is wrong

Explanation:

exploitation is wrong because it is coercive; the exploited are forced to benefit others, and that is not just. 1 But another group holds that exploitation is wrong because it degrades its victims; they are treated as means, not ends.

6 0
3 years ago
How many degrees longitude seperate is los vegas from the international date line
Marina CMI [18]

Las Vegas is situated 115 degrees West.  

So the separation is 180 - 115 = 65 degrees.

7 0
3 years ago
True or false <br> Help me please
Oduvanchick [21]

Answer:

This is TRUE.

7 0
3 years ago
Read 2 more answers
Why is doctor Norman Borlaug often called “the man who saved a billion lives”
umka2103 [35]
Cause he saved a lot of lives
7 0
3 years ago
Read 2 more answers
Other questions:
  • What man made structure connects the mediterranean and the red sea
    13·1 answer
  • Detrital grains of _____ are likely to be concentrated in placer deposits of California
    5·2 answers
  • A "Board of Commissioners" has executive authority over ___ in Georgia.
    11·2 answers
  • What is the process by which sand dunes move forward on their downwind side?
    6·1 answer
  • What is one action that was not taken by Japanese leaders during the Meiji reforms?
    5·1 answer
  • Some people are so good at their professions that other companies will try to recruit them. True False
    7·1 answer
  • HELP PLEASE
    8·1 answer
  • Which physical feature can ONLY be found in the Western Ghats but not the Eastern Ghats? (choices are in the picture)
    14·2 answers
  • Sometimes more than two plates come together at a special kind of plate boundary, as shown in the figure. What type of plate bou
    5·1 answer
  • The yukon is the longest river in which u.s. state?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!