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Ross theory of insect evolution, proposed by Ross, is a significant concept in understanding the origin and diversification of insects within the framework of insect taxonomy and morphology. According to Ross, insects originated from a primitive aquatic arthropod ancestor. These ancestors were believed to possess simple, segmented bodies with rudimentary appendages adapted for swimming. The transition from aquatic to terrestrial habitats played a crucial ____ ____ __________ ___ ________ _____ ____ ____ ________.
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