Final answer:
Oxygen is a chemical that supplies its own oxygen and helps other combustible materials burn more readily.
Step-by-step explanation:
The answer is Oxygen, which is a chemical which supplies its own oxygen and helps other combustible materials burn more readily. Combustion refers to a reaction in which a flammable substance reacts with oxygen. When a flammable substance, such as wood, is exposed to oxygen, it undergoes combustion and releases heat energy.