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5. You put twelve big fishes in an aquarium which contains three gallons
of water. You fed them with the right amount of food. After five
days, some of the fishes died. Why did it happen?
A. The smelly and cloudy water in the aquarium was not replaced
B. There was no enough space for the fishes and they compete for
food.
C. The aquarium was not moved to another place.
D. The aquarium did not have enough temperature.