According to piaget, children who can classify or divide things into different sets or subsets and consider their interrelationships are in which stage of development

The correct answer is the concrete operational thought. This is being defined as a way of children to be able to perform concrete operations by having to reason out in a more logical manner that is applied to specific examples or concrete examples.

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well, there are a lot of places we get information about earth from. like science classes, websites, books, newspapers, etc.