Compléter Piaget terminology fill-inVersion en ligne Praxis prep fill-in par Shaner Adams 1 Object is the understanding acquired by infants ages eight to 12 months , that continue to even when they cannot be , heard , or touched . Class is the relation between two classes in which all members of one class are included in the other , as in the proposition " All humans are animals . " According to ? s model , between the ages of seven and 11 , children in the operational stage of cognitive development , acquire the concept of when they master the ability to logically determine that a certain quantity will remain the despite adjustment to the container , shape , or apparent size . is the arithmetic operation of finding the between two quantities of numbers .
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