Abstract Background The COVID-19 pandemic is adversely impacting modern human civilization. A global view using a systems science approach is necessary to recognize the close interactions between health of animals. humans and the environment. Discussion A model is developed initially by describing five sequential or parallel steps on how a RNA virus emerged from animals and became a p... https://www.roneverhart.com/Lucky-Shamrock-4-leaf-Clover-Buckle-With-FREE-Leather-Belt/