जब एक छोटा बच्चा पहली बार ऊँट को देखता है, तो वह उसे 'कूबड़ वाला घोड़ा' कहता है। पियाजे के सिद्धांत में, यह किसका उदाहरण है?

In Piaget's theory, what process describes an infant's action when she changes the way she holds her hand as she reaches for round objects as opposed to square ones?

The ability to form and use symbols is a major accomplishment of which stage of Piaget's cognitive development?