The spiral patterns on pine cones and cycads, the number of petals on certain flowers, the number of leaves on the stems of some plants, and the arrangement of seeds on a sunflower seed head are some examples of Fibonacci sequences.
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It's not used anywhere by people. But it's used by Nature, wherever plants grow.
A few examples: Counting numbers are an arithmetic sequence. Radioactive decay, (uncontrolled) bacterial growth follow geometric sequences. The Fibonacci sequence is widespread in nature.
It is found in many different areas and the mechanism varies according to where it is found.
because, for instance, the number of petals on most types of flowers is usually a number that can be found in the Fibonacci sequence.
the Fibonacci sequence is found in... Nature Art Leaf formations pine cones pineapples flowers paintings veggies and fruit building design and that is just a few examples