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What did Piaget mean by an "operation" (as in "concrete operations") ?
Q24: Three semicircular canals and two otolith organs
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Q45: Under which of the following circumstances is
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Q188: A longitudinal study of 2,402 low-income families
Q190: An investigator who uses a _ design
Q214: Repeatedly presenting the CS without the UCS
Q224: After damage to his hippocampus,patient H.M.lost most
Q241: Some 2 1/2-year-old children are shown a
Q268: If a stimulus is just slightly weaker