Some metropolitan areas contain metropolitan divisions. Two metropolitan divisions exist within the DallasâFort WorthâArlington MSA. The term metropolitan division is used to refer to a county or group of counties within a metropolitan area that has a population core of at least 2.5 million.
The bees carry the propolis back to their hives and mix it with their salivary secretions and wax flakes. Propolis contains 55% resins and balsams, 30% beeswax, 10% etheric oils, and 5% pollen.
Bees make propolis, which they use to glue the materials of their hives together, by mixing beeswax and other secretions with resins from the buds of conifer and poplar trees. Those resins have natural germicidal properties.