The history of coronaviruses is an account of the discovery of coronaviruses and the diseases they cause.It starts with a report of a new type of upper-respiratory tract disease among chickens in North Dakota, US, in 1931.The causative agent was identified as a virus in 1933.By 1936, Twin Sleigh Storage Bed the disease and the virus were recognised

Soil erosion represents a geomorphological and geological hazard that may cause property damage, loss of livelihoods and services, social and economic disruption, or environmental damage.Erosion of our soils not only lowers the quality of soils on site, resulting in a drastic reduction of their ecosystem functions that play a vital role in daily li