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.
Educational Attainment. Education level is a major difference in blue-collar and white-collar jobs. White-collar work generally requires formal education. White-collar workers typically have at least a high school diploma, while most complete an associate's, bachelor's, master's or professional degree.