Who made humans?

Who Made Humans?
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Three freshman engineering students were sitting
around one day arguing about who might've designed
the human body.

The first one said, "It must've been a mechanical engineer. The human body has all those levers and pivots and stuff - a mechanical engineer must have designed all that."

The second one said, "No, it had to have been an electrical engineer. The complex way the nerves are
wired up to the brain must have been designed by an electrical engineer."

Then the third one said, "No, it was a civil engineer. Who else would have run a waste waterline through a recreational area?"