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Concrete events refer to real-life experiences or objects that are tangible and observable. In terms of Piaget's theory, it is during the concrete operational stage that children begin to think logically about these events.
The concept that certain properties (such as quantity or volume) remain constant despite changes in appearance.
Reversibility: The ability to mentally undo an action or operation.
Seriation: The skill of arranging items or objects in order based on size, length, or other characteristics.