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Nine-year-old Desi is in the _____ stage of cognitive development whereas her 15-year-old brother is likely in the _____ stage.

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User Lacer
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Nine year old Desi is in the Concrete Operational Stage of cognitive development whereas her 15 year old brother isl likely in the Formal Operational Stage. Concrete operational stage occurs from ages 7 to 11 while Formal operational stage occurs at 11 years old and above.

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User Nitzmahone
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