A planetary nebula is a (ring-shaped) type of nebula formed by an expanding shell of gas around an aging star. *a planetary nebula is a type of nebula*. im not completely certain though. i might be wrong.
B. They can often include and affect other factors which can be difficult to find a solution that doesn’t leave behind a negative affect.
One of the main reasons why some areas to the east of the pacific mountain ranges are having a desert climate is that the "<span>air loses much of its moisture as it moves from the pacific ocean eastward up the mountains." In addition, the significant influence of the Pacific Ocean proved to be a factor for desertification among these lands as it moderates temperature extremes.</span>
it could also be (the discount rate on overnight loans is lowered) this could also be one of your answers
