Answer: conservation.
Step-by-step explanation:
In Jean Piaget’s Cognitive Theory, conservation is a logical thinking skill that enables us to conclude that a specific quantity will remain the same notwithstanding any change of the container, shape, or size. According to Piaget´s theory, children udergoing the preoperational stage of development between ages 2 to 7 don´t have this conservation capacity yet. Conservation emerges in the concrete operational stage (ages 7 to 11).