Cicada Emergence Welcome! You are encouraged to register with the site and login (for free). When you register, you support the site and your question history is saved.North American cicadas always garner attention when they come above ground at the end of their 17-year life cycle, but in no case were they as well studied as was their emergence during the 1920s, when the naturalist William T. Davis studied them in detail. was their emergence during the 1920s had their 1920s emergence in their emergence during the 1920s their emergence during the 1920s was their emergence during the 1920s Review Answer