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location Melbourne, Australia
age 43
visits member for 2 years, 4 months
seen Sep 19 '12 at 0:18
Amateur programmer... for kicks mostly

comment How does a plant decide when to grow a branch?
Great answer Richard. Upvoted. You refer to a chaotic process that determines new areas of auxin concentration between meristems as the plant grows, so I guess the simplest answer to my question is "chance, within the confines of a system". There doesn't appear to be any DNA-style central planning at work.