Which region of the brain appears to have the oldest evolutionary history?

Name: Which region of the brain appears to have the oldest evolutionary history?
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The brainstem is the region of the brain that governs basic physiological processes such as breathing, heart rate, and sleep. It is often considered the oldest region of the brain from an evolutionary perspective as these processes are necessary for survival and were present in primitive organisms.

Which Region of the Brain Appears to Have the Oldest