____ is when preoperational children fail to understand that objects can be simultaneously part of more than one "class" or group.

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Classification is the ability to understand that objects can belong to multiple categories or groups at the same time. Preoperational children often struggle with classification, believing that an object can only belong to one group at a time, which is known as "class inclusion." Egocentrism refers to the child's inability to see things from another person's perspective. Conservation is the understanding that even if the appearance of an object changes, its basic properties remain the same. Reversibility is the ability to mentally reverse the steps of a process.

____ Is When Preoperational Children Fail to Understand That Objects