Throughout all of the Linnaean kingdoms, there is a vast library of striking similarities found between species which are only distantly related ...
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... skies come from the Wing-Assisted Incline Running Hypothesis. The Wing-Assisted Incline Running hypothesis is an adaptation of the cursorial model, which suggests that flight came from the gradual improvement forelimbs to aid of small jumps, which over time developed into full blown flight, and instead predicts that the use of forelimb propulsion to help the terrestrial dinosaur run up steep inclines gradually led to the development and strengthening of the forelimbs, to create wing like structures which facilitated flight (Nudds et al., 2009). Gradually, the pentadactyl bone system has been lost over time, being scaled down to just three bones, which anchor the primary flight feathers, while the humerus, radius and ulna provide the main structure to the wing (Vazquez, 1994), unlike bats and pterosaurs where a lot of the membrane support comes from elongated finger.
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