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15 nov 2004 año - Cognitive Development 4 years 6 months I throw a fit because my brother has 4 pieces cut of one hot dog and I only have 3 pieces. Even though they are the same, my conservation of matter is not developed and I don't realize the difference.

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6 nov 2018
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15 nov 2004 año
Ahora mismo
~ 20 years ago

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