What is the difference between a natural kind and an artifact?

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What is the difference between a natural kind and an artifact? What does research on children’s understanding of transformations of natural kinds and artifacts reveal about their developing biological theory?Give four explanations for why older children typically perform better on memory tasks than younger children. Back up each explanation with empirical evidence.What is infantile amnesia and what theories have been proposed to account for it? What does research evidence reveal concerning these theories?