Examples of homeostasis include the regulation of body temperature, the pH of extracellular fluid, or the concentrations of sodium, potassium and calcium ions as well as that of glucose in the blood plasma, despite changes in the environment, diet, or level of activity.
Blue-collar workers perform labor jobs and typically work with their hands. The skills necessary for blue-collar work vary by occupation. Some blue-collar occupations require highly skilled personnel who are formally trained and certified.
Under current rules, employers can declare certain executive, administrative and professional workers as exempt from overtime pay. However, those rules says that white-collar employees who are paid on a salary basis and earn less than $455 per week ($23,660 annually) automatically qualify for overtime pay.