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1. Water PollutionPresented By: Dr. Md. Salequr Rahman Dep. Of Community Medicine 2. What is water? Water is made of tiny molecules of hydrogen and oxygen.Each one is so…

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1. 1WATER 2. 2What is water?Water is made of tiny molecules of hydrogen and oxygen.Each one is so small that you can’t see it even with the mostpowerful microscope.Pure…

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Building Wrap Building Wrap And moisture control By Angus Robertson Building wrap allows water vapour ( invisible steam) to pass through but does not allow water to pass…