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.
Animal care workers are a unique group that includes trainers, kennel staff, groomers and other caretakers who oversee every aspect of an animal's healthy life. The good news is that you get to leave the sick and sad parts to a veterinarian and save all the fun stuff for yourself.