Key+Question+4+(WATER)

How is it changing? The water contamination is getting worst and worst, every time when the humans do bad things to the water because the oxigen of the water is getting lower and the fishes die and the water began to have bad smells. Also the bacterias in the water produces sickness and also is not so much water in rivers because we use it a lot and probably in the future we could evaen have it . 

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