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- Why is having an equal number of neutral and positives important?If a consumer product contains nanoparticles or is manufactured/packaged through nanotechnology, is it okay to buy it? Justify the answer.A drug has a half life of 4.5 hours. The drug is administered by I/V injection, and immediately after administration its plasma level is 68mcg/ml. Results for a blood test show a plasma level of 2.125mcg/ml. How many half lives have passed?