Two closed, pyramid-shaped beakers containing clearly identical amounts of a liquid are suddenly judged by a child to hold different amounts after one of the beakers is inverted. The child apparently lacks a:.

The answer is concept of conservation.

Explanation:

The concept of conservation is acquired when a person realises the distribution or form of an object doesn't change the properties of the object itself.

For example: an adolescent or adult will realise that a chocolate bar that's been sliced into four pieces is still the amount of chocolate. According to psychologist Jean Piaget, a child around ages two and seven will probably think the object has changed, and that there's now less chocolate.

The lack of understanding of this concept is characteristic of the preoperational stage.

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