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
Lady_Fox [76]
3 years ago
8

How did Earth's atmosphere become oxygen-rich?

Biology
1 answer:
eduard3 years ago
4 0

Answer:

The answer is tiny organisms known as cyanobacteria, or blue-green algae. These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. ... "What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago.

You might be interested in
Who benefits from globalization easy answers pls
kolezko [41]
Developing nations experience an improved general style of living thanks to globalization. According to the World Bank, extreme poverty decreased by 35% since 1990. Later, the target of the first Millennium Development Goal was to cut the 1990 poverty rate in half by 2015.
3 0
3 years ago
Read 2 more answers
Which conditions are required for natural selection? Select three options.
Archy [21]

Answer:

Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.

3 0
4 years ago
Read 2 more answers
What are the 3 functions of mitosis
sineoko [7]

the three functions of mitosis are Asexual Reproduction, growth, and tissue repair.

5 0
3 years ago
What was the author implying when she wrote the<br>sentence?​ world history
Sever21 [200]
You need more context for people to answer the question. We can’t respond with so little. We need to see the sentence so we can answer you problem.
8 0
3 years ago
How do models provide a provide a practical solution for some scientific research
Lostsunrise [7]

Answer:

The scientific models are the simplified visual representations of the complex processes or systems of the natural world.

The models serve many important purposes in scientific investigations as they are used by the researchers to test the predicted hypothesis proposed and to explain the results to another group of peoples which could be a layman.

The 3 D structures of molecules are represented by the globular models and stick key models which even represents the bonds between atoms.

3 0
3 years ago
Other questions:
  • Many insects, such as mosquitoes and dragonflies, spend their juvenile stage as aquatic larvae before becoming winged and airbor
    7·1 answer
  • 4. Crustaceans are well adapted to life on the rocky shore because they have (2 points)
    13·1 answer
  • Cross an individual who is heterozygous for 2 traits with an individual who is homozygous for the same 2 traits. List the genoty
    6·1 answer
  • What are the four stages of cell signaling?
    10·1 answer
  • A somatic cell of a ferret contains 40 chromosomes.How many will it have after mitosis?​
    10·2 answers
  • Which type of traits are determined by more than one gene?
    13·1 answer
  • Electromagnetic energy can be defined as which of the following?
    8·2 answers
  • (b)
    14·1 answer
  • I GIVE BRAINLIEST <br><br> Can someone help me in number (8) pls
    8·1 answer
  • Internal forces of sources which what is exert on each other in the bodies are part of the system is 
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!