Final answer:
Heat, fuel, and oxygen are essential for fire to occur.
Explanation:
Heat is necessary for the initial ignition and spread of fire by drying out and preheating fuel and air. Fuel is any combustible material, including wood, coal, propane, and gasoline, that reacts with oxygen to release energy. Oxygen supports the chemical processes in fire by reacting with the fuel to release heat and combustion products.
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