Explanation:
The brain itself does not feel pain because there are no nociceptors located in brain tissue itself. This feature explains why neurosurgeons can operate on brain tissue without causing a patient discomfort, and, in some cases, can even perform surgery while the patient is awake.
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Answer:
A. are all elements the rest are combinations of elements
The inputs are glucose and oxygen and the outputs are water and carbon dioxide.
I believe that would be mostly oxygen
