I am not alive, but I can grow; I don’t have lungs, but I need air. What am I?

Category: Brain · Difficulty: medium

Hint: Think about something that needs fuel and oxygen.

Answer

A flame

Explanation

Fire can expand and spread like it is growing, but it is not a living organism.

This is a medium brain riddle — a moderate challenge for most people. The answer is A flame.

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