Question: In elementary school (grades1 to6), there is a strong association between a child's height and the child's reading ability. Taller children tend to be able

In elementary school (grades1 to6), there is a strong association between a child's height and the child's reading ability. Taller children tend to be able to read at a higher level. However, there is a very significant confounding variable that is influencing both height and reading ability. What is it?

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