'If rainforests and tropical forests are the lungs of th

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'If rainforests and tropical forests are the lungs of the Earth, then surely wetlands function as its kidneys.'

Which one of the following functions of wetlands best reflects the above statement ?

[UPSC PRELIMS GS 1 2022]

The water cycle in wetlands involves surface runoff, subsoil percolation and evaporation

Algae form the nutrient base upon which fish, crustaceans, molluscs, birds, reptiles and mammals thrive.

Wetlands play a vital role in maintaining sedimentation balance and soil stabilization.

Aquatic plants absorb heavy metals and excess nutrients.

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