Preoperational Stage

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The preoperational stage is one of Piaget's four stages of cognitive development. Infants between the ages of 18 and 24 months acquire the ability to visualize objects and events mentally. Playing house and war games are an example of a children's ability to do this. At 7, the child moves to the next stage: Concrete Operations.

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Question: In the human eye, there are approximately 120 million ______, which are the visual receptors that are vital for night vision, while there are approximately 6.4 million _____ that help us see color.


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