A primary difference between phyllite and schist is that ____________. 
Definitions:
Optimal Circumstances
Conditions or situations that provide the best possible environment for achieving a desired outcome or for the occurrence of a specified event.
Medically
Relating to the science or practice of medicine, concerned with the diagnosis, treatment, and prevention of disease.
Wechsler Intelligence Test
A standardized test designed to measure human intelligence through various verbal and performance-based assessments.
Wechsler Preschool
An intelligence test designed specifically for young children, assessing various types of intellectual functioning.
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