Ms. Chen, a kindergarten teacher, shows her students two identical balls of Play Dough. She then flattens one into a "pancake" and asks them whether the ball or pancake has more Play Dough. Some say the pancake because it is wider; some say the ball because it's taller. All of the children's answers exhibit

Question

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The children's answers exhibit a lack of reversibility, as they do not understand that the amount of Play Dough remains the same despite the change in shape.

Ms Chen, a Kindergarten Teacher, Shows Her Students Two Identical