Heart disease is the leading cause of death among both men and women in the United States. It is usually caused when a sticky substance called plaque builds up in the arteries. Often, the only symptoms of heart disease are chest pain or discomfort. Why do you think heart disease is so prevalent in the United States? How could heart disease affect other organ systems?

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d