Holly reads a website article about the effects of ultraviolet rays. The article includes both positive effects: triggers vitamin d production in body, helps some skin conditions, and helps improve mood and depression - and negative effects: causes sunburn and skin cancer, damages eyes, ages skin, weakens plastics, and fades colors. What conclusion is she likely to draw from this information?

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.