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Social Studies, 30.12.2019 23:31 gagehamel

In the 1980's it was generally believed that congenital abnormalities affected about 5% of the nation's children. some people believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of abnormalities. a recent study examined 384 children and found that 46 of them showed signs of an abnormality. is this strong evidence that the risk has increased?

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