Preadaptation

Preadaptation describes a situation where an organism uses a preexisting anatomical structure inherited from an ancestor for a potentially unrelated purpose. One example of preadaptation is insect flight as insects were originally exclusively terrestrial, some with fanlike structures for cooling which were selected for until they were large and efficient enough to allow flight (Bickerton 2000, p.160). Another is the example of dinosaurs having used feathers for insulation and display before using them to fly.

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Some biologists prefer the term 'co-option' as a literal interpretation of preadapation' could imply an intentional plan, which is contrary to evolution.

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