After you have read RAZD's resources available online, you may want to actually follow up on insect wing evolution by visiting a university library and seeking out these articles:
Rowing locomotion by a stonefly that possesses the ancestral pterygote condition of co-occurring wings and abdominal gills. By: MARDEN, JAMES H.; THOMAS, MICHAEL A.. Biological Journal of the Linnean Society, Jun2003, Vol. 79 Issue 2, p341-349, 9p; DOI: 10.1046/j.1095-8312.2003.00192.x;
Diverse Adaptations of an Ancestral Gill: A Common Evolutionary Origin for Wings, Breathing Organs, and Spinnerets. By: Damen, Wim G.M.; Saridaki, Theodora; Averof, Michalis. Current Biology, Oct2002, Vol. 12 Issue 19, p1711, 6p;
Form And Function Of Insect Wings, The Evolution Of Biological Structures. By: Wootton, Robin. Systematic Entomology, Jul2000, Vol. 25 Issue 3, p406-407, 6p; DOI: 10.1046/j.1365-3113.2000.00121-2.x;
Evolutionary origin of insect wings from ancestral gills. (cover story) By: Averof, Michalis; Cohen, Stephen M.. Nature, 2/13/97, Vol. 385 Issue 6617, p627, 4p, 6 diagrams, 11bw;
Surface-skimming stoneflies: A possible intermediate stage in insect flight evolution. By: Marden, James H.; Kramer, Melissa G.. Science, 10/21/94, Vol. 266 Issue 5184, p427, 4p, 2 charts, 1 diagram, 4 graphs, 6bw;
Read not to contradict and confute, not to believe and take for granted, not to find talk and discourse, but to weigh and consider - Francis Bacon
The more we understand particular things, the more we understand God - Spinoza
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