Which of these is an example of a service industry job in an urban center? a farmer a bank clerk a factory worker a railroad worker

An urban environment would be a city, so the answer is a bank clerk. Farmer is agriculture and Factory and Railroad workers are industrial

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.