At nearly 14 years of age, Jillian's thought process is more complex than when she was younger. According to Piaget, the core difference is her ability to use and understand ______ concepts.

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According to Piaget's theory of cognitive development, by the age of approximately 12 years and onwards, individuals enter the formal operational stage, where they develop the ability to think abstractly and reason about hypothetical problems.

At Nearly 14 Years of Age, Jillian's Thought Process Is