Answer:
Carbon dioxide from volcanic activity became a major part of the atmosphere.
Explanation:
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The correct answer is - cyanobacteria.
The atmospheric oxygen came from the cyanobacteria. These were one of the earliest living organisms on Earth. The cyanobacteria was using photosynthesis in order to create its own food. The photosynthesis process requires sunlight, carbon dioxide, water, and oxygen. The oxygen is mostly released as a waste product from the process of photosynthesis, thus the cyanobacteria were literally releasing oxygen that was ending up into the atmosphere. As more and more cyanobacteria there were across the planet, more and more oxygen they were releasing into the atmosphere, slowly changing the composition of the atmosphere, and setting the basis of it as we know it now.
(A) A and B are the two letters that represent gulfs.
<h3>
What are gulfs?</h3>
- A gulf is a large inlet from the ocean into the continent, usually having a narrower opening than a bay, however, this is not always the case in all geographical places thus named.
- The term gulf was traditionally applied to huge, indented areas of saline water surrounded by a coastline.
- Many gulfs, including the Persian Gulf, Gulf of Mexico, Gulf of Finland, and the Gulf of Aden, are important shipping lanes.
- The United States Gulf Coast, often known as the Gulf South, is the coastline that runs along the southern United States where it meets the Gulf of Mexico.
Therefore, (A) A and B are the two letters that represent gulfs.
Know more about Gulfs here:
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Complete question:
Each of the letters on the map above marks a body of water in Southeast Asia. Which two letters represent gulfs?
A. A and B
B. B and C
C. C and D
D. A and C