Consider the following structural formula. 
The following is a resonance structure. 
Definitions:
Irreversible Cessation
The permanent end of an activity or function, such as life, signaling no possibility of revival or continuation.
Brain Functions
The activities carried out by the brain that enable thought, behavior, perceiving, feeling, and actions, including cognitive and emotional functions.
Higher-Brain
Refers to the concept in neuroethics and philosophy of mind that relates to the cognitive functions of the brain, such as thought, reason, and consciousness.
Whole-Brain
A concept often used in discussions of brain death, considering the cessation of all functions of the entire brain as a criterion.
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