QUIZ: Can We Guess Your Education Level?
What does the O stand for in H2O?

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The O in H2O stands for Oxygen. Yep, you know that resource that we would die without? It’s pretty important. We all know it, we all breathe it. Oxygen. Osmium is a metal.
Cate Gillon/Getty Images
Cate Gillon/Getty Images
What does the O stand for in H2O?
- Nitrogen
- Osmium
- 0-Zero
- Oxygen
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