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Biology, 10.03.2020 17:38 bossboybaker

The cleaning of water often happens in several steps involving Different techniques the cleaning process shown in the figure involves four steps in the second step the water is collected in a settling pond in what way does this step make the water cleaner. a) The bacteria in the water die.
b) oxygen is added to the water.
c) gravel and sand sink to the bottom
d) Toxic substances are broken down.


The cleaning of water often happens in several steps involving Different techniques the cleaning pro

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