Eight-year-old Johnny and his mother are making cookies. Johnny's mother gives him two pieces of dough that are rolled into balls. She asks him to take the rolling pin and roll one flat. Johnny recognizes that both pieces of dough are still of equal size. He has mastered conservation of

Question

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Johnny understands that despite the change in shape, the amount of dough (mass) remains the same, demonstrating conservation of mass.

Eight-Year-Old Johnny and His Mother Are Making Cookies