Mathematics, 12.11.2019 07:31, elizabeth15ovando

If you are studying the effects of uv rays on eyesight and you group 10 people together and make them wear sunglasses for 10 weeks and see if their eyesight is affected and then take another group and do not give them sunglasses and test their vision after 10 weeks, what is the treatment ?

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If you are studying the effects of uv rays on eyesight and you group 10 people together and make the...