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Scientists in Chicago measure the amount of oxygen and carbon dioxide in Lake Michigan. This helps them determine the health of the lake ecosystem. In July, scientists noticed a large decrease in oxygen levels in the lake. The decrease in oxygen could be due to:

a) A decrease in fish populations.
b) A decrease in plant growth.
c) An increase in plant growth.
d) An increase in rain water supplied to the lake.​

User Roschach
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B is the answer to the question
User Jeyaganesh
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