Negative feedback: If blood pressure is high, the blood vessels should A. dilate (open up more)
B. constrict (get tighter)

Dilate.. constrict would be for the opposite

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.