I am the pathway for nutrients, essential for life, yet I am not a road. What am I?
Category: Science · Difficulty: hard
Hint: Think about how cells regulate what enters and exits.
Answer
Cell Membrane
Explanation
The cell membrane controls the movement of substances in and out of the cell, acting like a selective barrier.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Cell Membrane.
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