A laboratory experiment was done to show the effects of organic waste on the dissolved oxygen (DO) content in water. Five tanks were set up, each containing fresh water and a small amount of single-celled green algae. Specified amounts of organic waste were added to the tanks. The results below show the amount of DO in each tank after a period of one week. Which of the following TANKS can be used as the CONTROL GROUP for this experiment? *
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A laboratory experiment was done to show the effects of organic waste on the dissolved oxygen (DO) c...
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