I am not alive, but I can grow. I don't have lungs, but I need air. What am I?
Category: Brain Teasers · Difficulty: hard
Hint: Consider something that consumes material to expand.
Answer
A flame
Explanation
Fire is a chemical reaction that requires oxygen to sustain itself and can appear to 'grow' as it consumes fuel.
This is a hard brain teasers riddle — a tricky one that takes a little thought. The answer is A flame.
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