To form rational subgroups for an 
-chart,the goal is to choose the samples as _____ as possible.
Definitions:
Biochemical Changes
Alterations in the chemical processes and substances within living organisms, often referring to changes that affect mood, behavior, and cognition.
Brain Waves
Patterns of electrical activity in the brain, indicative of different states of consciousness, such as wakefulness or sleep.
Positron-Emission Tomography
A diagnostic imaging technique that uses radioactive substances to visualize and measure changes in metabolic processes.
Biochemical Activity
The chemical processes and reactions that occur within living organisms.
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