Which evidence best supports the theory that the universe began with a massive explosion? cosmic background radiation in space.
parallelism of planetary axes.
life cycle of stars.
(Pretty sure it’s the 1st answer but I can never be to sure)

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.