In Jean Piaget's theory of cognitive development, conservation is achieved by the child in the:

In accordance with Jean Piaget's theory of cognitive development, a teacher should give tasks requiring ________ to students in the age group of 7-11 years for working independently.

A 6-year-old child reasons that a taller glass has more water than a shorter and wider container, even though the liquid has been poured from the container into the glass in front of her eyes. According to Jean Piaget, this kind of reasoning is due to the child's inability to: