Which element, essential for human life, has the chemical symbol 'O'?
Category: Knowledge · Difficulty: hard
Hint: This gas is crucial for respiration.
Answer
Oxygen
Explanation
Oxygen, represented by the symbol 'O', is vital for human life as it is required for respiration.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Oxygen.
More Knowledge riddles
- I can be found in a game, yet I don't have a physical form. I often require strategy and thought. What am I?
- I can symbolize cultures but have no voice, I can tell stories without words. What am I?
- I can be counted but have no physical presence, I am divided but represent unity. What am I?
- I can be found in trees but am not a leaf, I can be eaten but am not a fruit. What am I?
- I can guard a treasure but am not alive. What am I?
- I happen once a year, and often you celebrate my arrival. What am I?
- I brush your skin softly but leave no mark. What am I?
- I shine steady through fog and night to show a safe path. What am I?