The principle of ____ suggests that physical properties of substances, such as volume, number, and mass, remain constant in spite of changes in their shape or appearance.

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The principle of conservation refers to the understanding that despite changes in appearance or arrangement, certain properties (such as volume, number, and mass) remain the same. This is a key concept in cognitive development, particularly in Piaget's theory. Option A refers to the concept of object permanence, which is the understanding that objects continue to exist even when they are not within the individual's perception. Option B, centration, refers to the tendency to focus on one aspect of a situation and not take into account other relevant factors. Option C, egocentrism, refers to the difficulty in taking another person's perspective or understanding that other people may experience the world differently.

The Principle of ____ Suggests That Physical Properties of Substances