Mastering which cognitive process is the hallmark achievement of the concrete operational period?

Question

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Conservation is the cognitive process that is considered the hallmark achievement of the concrete operational period, according to Jean Piaget's theory of cognitive development. This stage typically occurs between the ages of 7 and 11 years old, and conservation refers to the understanding that certain properties of objects, such as volume, mass, and number, remain the same despite changes in the forms or arrangements of the objects.

Mastering Which Cognitive Process Is the Hallmark Achievement of the Concrete