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The ____________ is an important requirement of the aquatic life.

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The ____________ is an important requirement of the aquatic life.

(a) Dissolved nitrogen

(b) Dissolved chlorine

(c) Dissolved oxygen

(d) Dissolved methane

This question was posed to me in an international level competition.

This key question is from Types of Water Pollutants and Effects topic in chapter Water of Applied Chemistry

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Correct choice is (c) Dissolved oxygen

To explain I would say: The dissolved oxygen is an important requirement of the aquatic life. They take oxygen from the water to survive.

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