According to piaget, children have acquired the cognitive skill of conservation when they're able to
a. understand the viewpoint of other people."> a. understand the viewpoint of other people. b. realize that the term heavy describes an object one way and the term big describes it another way."> b. realize that the term heavy describes an object one way and the term big describes it another way. c. understand that six ounces of liquid in a jar and six ounces in an elongated tube are