Air exerts pressure from ______ sides., above, below, right, all, The layer of gas that surrounds the Earth is ______, uv rays, atmosphere, oxygen, nitrogen, Plants absorb minerals dissolved in _____ through their roots, water, sunlight, air, leaves, During the process of respiration, plants use ______, oxygen, carbon dioxide, nitrogen, argon, To remove insoluble impurities in water we can use _____________________., sedimentation, decantation, filtration, all of these, Substance used to purify water, alum, solute, salt, sugar

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