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A level Biology: Post your doubts here!

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you have to remember this two things... almost no explanation.... just see that water forms hydrogen bonds.
Hey hey answer is A.I think it explains.Water is a solvent so the mineral nutrients dissolve in water.As water has greatest density at 4 degrees it means that as lake gets warmer,the water at 4 degrees sinks and cooler water rises.So mineral nutrients are brought to the surface.
 
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