It is necessary to conserve wetland because

It purify surface water

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It recharge ground water

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It holds back water

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Both A and B

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Solution

The correct option is D Both A and B
The wetlands are responsible for the trapping of the chemicals and harmful wastes. This results in protection of the aquatic systems. This also helps to purify the water since the sediments and the waste is trapped in these regions. This protects the groundwater. The activity of the organisms in these regions allows recharging the surface and groundwater.
Thus, the correct answer is option D.

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