Question

the ______ is sometimes referred to as the old brain because its evolution can be traced back some 500 million years to primitive structures found in nonhuman species.

multiple choice

○ cerebral cortex

○ limbic system

○ central core

○ central nervous system

Explanation:

The central core of the brain (including structures like the brainstem) is evolutionarily ancient, with roots in non - human species' primitive brain structures, fitting the "old brain" description. The cerebral cortex is newer, the limbic system is mid - evolutionary, and the central nervous system is a broader term.

Answer:

C. central core