Piaget believed that peers serve an important role in teaching children how to function effectively with others because these relationships are optional.
For Piaget, a child's moral development is closely related to cognitive development. In other words, children are not capable of making advanced moral judgments until they are cognitively mature and see things from multiple perspectives.
Effective he is an adverb with two meanings. Use it when you want to effectively describe something or as an alternative to words like "actually" or "basically". If wearing special gloves can help you catch a soccer ball more efficiently, you can do your job more efficiently.
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