I am a wall yet not a barrier, protecting the inner life while allowing nutrients to enter. What am I?
Category: Science · Difficulty: expert
Hint: Think about what surrounds a cell and controls what goes in and out.
Answer
Plasma membrane
Explanation
The cell membrane is a selective barrier that regulates the passage of substances in and out of the cell.
This is a expert science riddle — one of the harder riddles here. The answer is Plasma membrane.
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