Lizzie, age 12, regularly asks questions such as, "what if everyone just got along? " and, "if i became a medical researcher, could i find a cure for cancer? " according to piaget's theory, these questions suggest that lizzie has acquired the ability to

she has acquired the ability to formally operate.

Explanation:

accorsing to paiget's theory formal operation is the ability to be concerned about hypothetical affairs and upcoming future concerns. moreover, creating hypothesis and questioning ideologies is a major part in the concept of formal operation.

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