एक बच्चे की यह समझ कि वस्तुएं तब भी अस्तित्व में रहती हैं जब उन्हें देखा या सुना नहीं जा सकता, कहलाती है:

What skill can be developed by asking children to arrange pebbles according to categories like shape, size, or colour?

In Jean Piaget's cognitive development theory, if a child encounters a completely new food and cannot fit it into their existing schema, what cognitive state do they experience?