I take in and give out, yet I have no mouth. I am crucial for survival, but too much of me can be harmful. What am I?
Category: Science · Difficulty: medium
Hint: Think about breathing.
Answer
A gas exchange
Explanation
Gas exchange is vital for respiration in living organisms, allowing oxygen in and carbon dioxide out.
This is a medium science riddle — a moderate challenge for most people. The answer is A gas exchange.
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