Is there any type of protection from gamma radiation?

  Well, Gamma isn't exactly something you would want to play with. So your best options are:

Distance from the radiation

Or Getting behind lead or concrete as they will greatly prevent any Gamma rays from reaching you. Hope this helps!

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.