Ketosis occurs when the body does not have any glucose stores left. So it has to switch to some other process to get energy. One process is gluconeogenesis in which the body creates glucose from fat/protein. The other is ketosis which is literally referes to the creation of ketone bodies from fat/protein.
C'mon Baby, Light My Fire. The ingredients needed to start a fire are traditionally illustrated in the fire triangle. The three legs of the triangle are fuel, oxygen and heat. When enough of these three factors is present, a chemical reaction occurs that results in fire. This is why you can start a fire with two sticks: The fuel is the sticks, the oxygen comes from the air and fiction provides the necessary heat. But this is far from the only circumstance in which friction starts a fire.
At a certain point in the combustion reaction, called the ignition point, flames are produced. The flame is the visible portion of the fire. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. If hot enough, the gases may become ionized to produce plasma. Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different. Fire in its most common form can result in conflagration, which has the potential to cause physical damage through burning.