Sunflowers are just one place in nature to spot a Fibonacci spiral. Two of these are examples—which one is not?

Sunflowers are just one place in nature to spot a Fibonacci spiral. Two of these are examples—which one is not?

A Seashells
B The shape of galaxies
C Porcupine spikes

The Milky Way is a spiral galaxy, and the nautilus shell is one of many spiral shells. Hurricanes, ferns, and spiderwebs also feature Fibonacci spirals. Porcupine spikes? Well, don’t study them too closely—they’re just sharp.

The correct answer is Porcupine spikes.

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