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.
The same plants often serve as a source nectar and pollen. Some plants (poplar, birch, cherry, etc.), in addition, secrete resinous substance, from which the bees make glue â propolis. Honey plants are classified mainly by flowering time, the nature of a harvest and habitats.