Question

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Answer 1

Answer:

paper towel is best filtration agent because all the the sand particles or gravels will left in in towel and clean water with no impurities will pass through it

Explanation:

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Answer 2

Answer:

I think cotton ball is best for filtering because a pore size of cotton is less than gauze square so it can filter more effectively and it does not absorb filtering material, like if we use paper towel and tissue it gets soaked and the process will be failure or the materials add up to the water so it further contaminates it. Gravel cannot be used as it absorb more and filter less. So final conclusion is COTTON BALLS ARE BEST FILTERING AGENT