Coronavirus disease 2019 (COVID-19) is a respiratory illness that started and rapidly became the pandemic of the century. as the number of people infected with it globally exceeded 253. 4 million. Since the beginning of the pandemic of COVID-19. https://ukowfbbe7y06wg.wikibuysell.com/1469112/the_beauty_of_simple_models_themes_in_recognition_heuristic_research