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Which part of the central nervous system includes the higher nervous centers?

  1. that part of the central nervous system that includes all the higher nervous centers

  2. one of the pair of tubes that branch off from the trachea and go into the lungs

  3. long and slender with a very small internal diameter

  4. unit of heat required to raise the temperature of water

The correct answer is: that part of the central nervous system that includes all the higher nervous centers

The correct answer is A. The central nervous system includes both the brain and spinal cord, but the "higher nervous centers" refer to the more complex and advanced functions of the brain, such as perception, consciousness, and reasoning. Option B is incorrect because the description does not match the central nervous system, and option C and D are incorrect because they are unrelated to the central nervous system and its functions.