Question

give reason fish die in a tank without water plants.
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Answer 1

Fish die in tank without water plant as Some fishes eat that plants and water plant produces oxygen which is inhaled by fish

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Answer 2

Plants release oxgen as a by-product.

we know oxgen is our basic need for survival.Due to this released oxygen fishes survive.in absense of plants there will be no dissolved oxygen in water for their survival.Also they eat plants as food without plants there will be no foodhence they die

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