What are the requirements for a fire to exist?

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Multiple Choice

What are the requirements for a fire to exist?

Explanation:
The key idea is that a fire needs a fuel and an oxidizer to exist. Without both of those, nothing will burn. The ignition source is what starts the combustion, but once heat from the reaction is present, a flame can continue as long as fuel and oxidizer are available. So having the oxidizer and the fuel is the essential setup for fire to exist, with the ignition source acting as the trigger to start it.

The key idea is that a fire needs a fuel and an oxidizer to exist. Without both of those, nothing will burn. The ignition source is what starts the combustion, but once heat from the reaction is present, a flame can continue as long as fuel and oxidizer are available. So having the oxidizer and the fuel is the essential setup for fire to exist, with the ignition source acting as the trigger to start it.

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