Why might the functioning of the nervous, circulatory, and digestive systems serve as a good analogy for how the heating, cooling, plumbing, and electrical systems of a building interact?

The nervous, circulatory, and digestive systems perform different jobs, but together they help keep the body alive and functioning normally. A building’s heating, cooling, plumbing, and electrical systems also have different roles that interact to keep the building usable. So the best analogy is that both sets of systems work together to support normal functioning: choice C.

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