What structure supports all life forms, though it is invisible to the naked eye and primarily made of cells?
Category: Science · Difficulty: hard
Hint: It regulates what enters and leaves the cell.
Answer
Cell structures
Explanation
The cell membrane is a barrier that protects the cell and controls the movement of substances in and out.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Cell structures.
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