27. suppose two stars are located in region a of the h-r diagram shown in the figure below. star x appears much dimmer than star y as see from earth. which star can be inferred to be nearer to earth, and how do you know?

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.