I am not alive, but I can grow; I don't have lungs, but I need air. What am I?
Category: Science · Difficulty: medium
Hint: I can be both a friend and a foe.
Answer
A fire
Explanation
Fire is a reaction that grows and requires oxygen, but it is not a living entity.
This is a medium science riddle — a moderate challenge for most people. The answer is A fire.
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