Longitudinal research by Tomlinson-Keasey (1979) indicates that children first develop conservation of mass, then weight and lastly volume. These findings are support for which one of the following Piagetian concept?

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Horizontal décalage refers to the observation that children may develop different types of conservation (such as mass, weight, and volume) at different ages, rather than all at once, which aligns with the findings of Tomlinson-Keasey's research.

Longitudinal Research by Tomlinson-Keasey (1979) Indicates That Children First Develop