Since the Fibonacci numbers follow a simple sequence they can commonly be found in many systems. Fibonacci patterns can be most commonly found amongst plants for efficient packing of similar sized features(e.g. spiky bits on a pineapple, or seeds in a sunflower). They're also found in system related to population growth.

However, while systems may appear to follow these numbers it does not reflect how all things grow in the natural world. And just because a series of numbers can be applied to an astonishing variety of objects that doesn't necessarily imply there's any correlation between figures and reality.
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