Your kidneys are complex organs. They regulate the amount of water lost from the body and get rid of waste products, especially urea. Urea is made when any excess amino acids are broken down in your liver.
Middle Class Income for a Family. The annual average income for a middle class family of four is approximately $70, 354. This is based on a 2006 report by the U.S. Census for a family of four. This figure is in the middle of the range of incomes for this section of the population. The median income during this time for all households was $48,561.
There are many different theories on the middle-middle class. The middle-middle class may be composed of those households with annual incomes of 80% to 120% of the national median household income. Persons in this income range could, in accordance to solely economic reasoning, be referred to as the American average.s social classes lack clear boundaries and overlap there are no definite income thresholds as for what is considered middle class. Sociologist Leonard Beeghley identifies a male making $57,000 and a female making $40,000 with a combined households income of $97,000 as a typical middle-class family.