How is paper made? paper is made with wood.

Paper is made in two steps: 

Cellulose fibers are extracted from a variety of sources and converted to pulp. Pulp is combined with water and placed on a paper making machine where it is flattened, dried, and cut into sheets and rolls.

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.