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/90557208-Guard-Right-Side-Black-Decker-Trimmer-NST2018-Type-8/