Neurons are the structural and functional units of where what is critical?\nOptions:\n- (A) organs\n- (B) Glial cells\n- (C) nerves\n- (D) Structural units\n- (E) voltage\n- (F) Storage units\n- (G) Critical care\n- (H) A computer Let's solve this problem gradually.

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Neurons are the structural and functional units of the nervous system. Glial cells perform critical functions in the nervous system. Neurons are the structural and functional units of where the glial cells perform critical functions. So the final answer is (B).
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