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What Is It? #23

What Is It? #23

This interlocking stack of frustules of the diatom Paralia sulcata bears a striking resemblance to the Tower of Pisa. Can you guess approximately how many of the miniature versions would have to be stacked on top of each other the equal the height of the real Tower?

A. 150

B. 1,500

C. 15,000

D. 150,000

E. 1,500,000

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