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Social Studies, 16.03.2020 21:09 nhester3378

Maria is studying the effects of calcium on the development of children. So, she administers varying levels of calcium to two groups of children, one group consisting of children aged 5 and the other group consisting of children aged 10. She studies the growth rate of these two groups regularly over a period of one year. On the basis of the given evidence, it would be most accurate to say that Maria is using the research.

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