Molly,age 8,is shown a measuring cup full of cornmeal,which is then poured out onto a countertop and spread around.She is asked whether the spread-out cornmeal is the same as,or different from,the cornmeal when it was in the cup.Molly says,"It's just the same,because it's the same cornmeal." In Piaget's terminology,Molly understands the principle of

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Molly's response shows that she understands the principle of identity, which is the ability to recognize that an object or substance remains the same despite changes in its appearance, shape, or form. She understands that the cornmeal in the cup is the same as the cornmeal spread out on the countertop because it is still cornmeal.

Molly,age 8,is Shown a Measuring Cup Full of Cornmeal,which Is