Journal Entry Critical Analysis

Wing evolution has been a highly debated topic in insects. Wings play a crucial role for insects since they are used to assist with collecting food, migration, fleeing from predators, and many other activities. There are three main theories that have been thoroughly researched to help explain the evolution of wings. These theories include the parental origin of wings, the tracheal gill theory, and the exit-endive theory. The parental origin of wings hypothesis states that wings developed from parental lobes.

When insects fell on the ground, nobles first acted like a racquet so the insect can land swiftly on its feet and scurry away from predators. As nobles grew larger they developed from gliders into wings. The main evidence behind this theory is the presence of broad thoracic onto and wing like pornographic lobes on fossils Of Ephemerals, Plenipotentiary and Appropriate that show venation and articulation (Whitfield 324).

The tracheal gill hypothesis postulates that wings developed from tracheae gills since both were thin, membranous and mobile. Gills first started off for being used for breathing in oxygen, then used as fins to promote locomotion, ND finally modified the spiracles which reduced water loss to permit gliding which eventually turned into flying. Wigglers supported this theory by stating that wings and legs could be found in the thorax if it was originated by exits (Whitfield 325).

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The exit-endive hypothesis proposes Koala-Peck's theory about wings developed from exits that were found on many leg bases of early insects. Later, it was found that those insects also had endives. This theory was us ported by the fact that wings are originated from a structural feature that already had the necessary muscles, tendons and appendages of insects. This was later proven by the dismissal of Montana's theory that insect's legs are different than other arthropods legs (Whitfield 326). Live that the exit-endive theory seems the most plausible since it is most likely that wings emerged from endives and exits since those features were already present in insects. Also this theory has the most support compared to the other two theories and there are not many who oppose this theory. For the tracheal gill hypothesis to be true, the invasion of land would have to happen twice to accommodate for both insects with wings and without wings,

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