I separate substances with my barrier, yet allow some to pass through. What am I?
Category: Science · Difficulty: medium
Hint: Consider what cells use to control substances.
Answer
Semipermeable membrane
Explanation
A semipermeable membrane only allows certain molecules to pass, being crucial for cellular function.
This is a medium science riddle — a moderate challenge for most people. The answer is Semipermeable membrane.
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