I am a part of the Earth’s atmosphere, essential for life yet invisible to the naked eye. What am I?
Category: Knowledge · Difficulty: hard
Hint: I make up about 21% of what you breathe.
Answer
Oxygen
Explanation
Oxygen is crucial for life on Earth and is a major component of the atmosphere.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Oxygen.
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