📝 Multiple Choice Question
General-science
The amount of dissolved oxygen in water becomes lowest at what time of the day?
A
In the dawn
B
In the evening
C
At night time
D
In the afternoon
Explanation
Dissolved oxygen levels universally hit their lowest point just before dawn because aquatic plants and algae consume oxygen through respiration all night without replacing it. Once the sun rises, photosynthesis resumes, and the dissolved oxygen levels slowly begin to increase.
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