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Fish must have oxygen in the water to survive. How would a decrease in oxygen affect the fish in the aquarium? The number of fish would increase. The number of fish would decrease. The variety of fish would increase. The variety of fish would decrease.

User Orluke
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2 Answers

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The number of fish will decrease because all of the fish need oxygen to survive
User Fredrick Brennan
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Answer:

the number of fish decrease i think

User Jasper Schulte
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