I am present in every cell, yet I am invisible without aid. My structure defines life, but I need a microscope. What am I?

Category: Science · Difficulty: hard

Hint: Consider the command center of a cell.

Answer

A cell's nucleus

Explanation

A cell's nucleus houses genetic material and controls cellular activities, yet it requires a microscope to be seen.

This is a hard science riddle — a tricky one that takes a little thought. The answer is A cell's nucleus.

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