erwin chargaff studied the dna of organisms within a single species. chargaff discovered that the amount of adenine is about equal to the amount of thymine. which of these explains why the ratio of adenine to thymine is nearly 1:1?

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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.