a scientist does a study in which she manipulates the presence of a microbe that lives in the plant's roots. she shows that, when the microbe is present, the plant sends extra sugars to the roots, thus costing the plant valuable resources. based on this, what can you conclude?

Your answer is d.all of the above! hope this ! : )

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.