Mr. Gallagher shows a group of children two candy bars. All children agree that the two bars have the same amount of candy. Then Mr. Gallagher breaks one candy bar into small pieces. At this point, some of the children still claim that the two candy bars (one whole and one broken) have the same amount of candy. Other children, however, claim that the broken bar has more candy. Using a Piagetian framework, Mr. Gallagher concludes that the children are in two different stages of cognitive development. Which stages are the two groups of children in? Explain why you made the decision that you made.