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{:((a),"Benthic",,-,"Bottom zone of"),(,...

`{:((a),"Benthic",,-,"Bottom zone of"),(,,,,"the pond"),((b),"Riparian vegetation",,-,"Lakes and"),(,,,,"ponds"),((c),"Deciduous forest",,-,"Heavy rainfall"),((d),"Grassland",,-,"Himalayas"):}`

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The correct Answer is:
Benthic - Bottom zone of the pond
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