Prevailing wages are established by regulatory agencies for each trade and occupation employed in the performance of public work, as well as by State Departments of Labor or their equivalents. Prevailing wages were first established shortly after the Civil War when Congress passed the National Eight Hour Day law.upporters suggest that prevailing wage laws seek to prevent public construction projects from destabilizing a local construction industry and to advance other priorities such as workforce development, green building, and greenhouse gas reduction.
In some species, the claspers are held in place by spiny projections. Claspers can also refer to appendages some male insects use to hold females in place during copulation. Male dragonflies, for example, have sharp claspers at the tip of their segmented bodies that fit into the back of the femaleâs head during mating. (Read more about dragonflies' strange sex habits.)
Because of its rigidity, cartilage often serves the purpose of holding tubes open in an animal's body. Examples include the rings of the trachea, such as the cricoid cartilage and carina, the torus tubarius at the opening of the pharyngotympanic/auditory tube, the ala of the nostrils, and the auricle/pinna of the ear.