The answer is: pseudostratified ciliated columnar epithelial cells.
We can find these type of cells in the upper part of the trachea and bronchi, and through the whole upper respiratory tract (nasal cavity included).
Their job is to produce a mocous secretion (look up <em>cilia</em>) help us to stop external, microscopical, materials from entering our lungs, and so we can sneeze and cough them away.
Bartering is trading, in today's society we buy and sell using currenxy
In the late 1800s, workers organized unions to solve their problems. Their problems were low wages and unsafe working conditions. ... First, workersformed local unions in single factories. These unions used strikes to try to force employers to increase wages or make working conditions safer.&For those in the industrial sector, organized labor unions fought for better wages, reasonable hours and safer working conditions. The labor movement led efforts to stop child labor, give health benefits and provide aid to workers who were injured or retired.