I exchange gases silently between living things and the atmosphere. What am I?
Category: Science · Difficulty: hard
Hint: Focus on the process of breathing at the cellular level involving oxygen and carbon dioxide.
Answer
A respiratory gas exchange
Explanation
Respiratory exchange moves gases in and out of organisms, distinct from photosynthesis or combustion.
This is a hard science riddle — a tricky one that takes a little thought. The answer is A respiratory gas exchange.
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