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Piaget's principle of conservation concerns the observed properties of substances. Psychologists apply this principle when they study _____ development in childhood

User Kninnug
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Cognitive development in childhood.

Piaget's theory of development mostly concerns with cognitive develompent in children, either quantitative or qualitative. Under his theory, there are many different phenomena that we can test today and see on which stage of cognition a child is.
User Gregor
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