The wings were folded to shield the insects especially for those species which did not evolve muscles relevant for flight. The wings are flapped by both the direct and indirect muscles during flying. Direct muscles are attached to the wings at the thoracic segment. For the insect to remain afloat, the various direct muscles attached to the different wings must be coordinated by the brain which processes signals necessary for the contraction or relaxation of the muscles (Engel, 2005). The brain of an insect must have therefore evolved together with the evolution of insect wings to ensure that the frequency of the flight schedules and maneuvers in the air are properly harmonized.
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