| A) | Argued that adults often switch from acquiring knowledge to applying knowledge.
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| B) | Infants as young as 4 months expect objects to be substantial and permanent.
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| C) | With Piaget, studied children's egocentrism using the three-mountains task.
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| D) | Believed cognitive skills have their origins in social relations.
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| E) | A child is more likely to conserve when attending to relevant aspects of a task.
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| F) | Adolescent egocentrism consists of an imaginary audience and personal fable.
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| G) | Adolescent absolute/dualistic thinking gives way to reflective/relativistic thought.
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| H) | Contributed to cognitive theory by observing his three children.
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