Which of the following environment is richest in free oxygen?
Cold fresh water
Salt water
Atmosphere
Warm fresh water
A
Atmosphere
B
Warm fresh water
C
Salt water
D
Cold fresh water
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Solution
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Oxygen is a major component of the atmosphere as well as a it is an abundant chemical element on earth. The main reason for the presence of oxygen in the atmosphere is photosynthesis. In this process the autotrophs convert inorganic materials such as carbon dioxide and water to biomass and oxygen is also generated during this process
So, the correct answer is option B.
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