The conditions which are most favorable for the formation of radiation fog are warm, moist air over low flat land areas,on clear, calm nights.
Radiation fog is most prevalent during the winter and fall; it usually forms overnight as the air closest air to the ground cool down. When the cooling makes the air to reach saturation point, radiation fog will formed.
A system is a group of organs that work together and provide an organism with an advantage for survival. It is the most complex organization in your body and the final level of the progression from cells to tissues to organs and then systems.