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.
What is a 'Collar'. A collar is a protective options strategy that is implemented after a long position in a stock has experienced substantial gains. An investor can create a collar position by purchasing an out-of-the-money put option while he simultaneously writes an out-of-the-money call option. A collar is also known as hedge wrapper.