I am essential for combustion and respiration, yet I am not visible. What element am I?
Category: Science · Difficulty: hard
Hint: You breathe me in and I help fires burn.
Answer
Oxygen
Explanation
Oxygen is crucial for respiration and combustion, yet it is a colorless and odorless gas.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Oxygen.
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