Joan often feels as though she is going to fall over while walking. her doctor diagnoses a tumor in her:

Cerebellum

Explanation:

If Joan often feels as though she is going to fall over while walking, she is likely to have a tumor in her cerebellum. The cerebellum ("little brain") is responsible for "primitive" actions such as regulation and coordination of movement, posture, and balance. These seem to be the skills that are affected in Joan's brain.

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