The immune system is designed to defend the body against invaders that include microorganisms, parasites, cancer cells, and transplanted organs and tissues. 1  The immune system defends against disease and infection via physical barriers, white blood cells, antibodies, complement proteins, and certain organs.
Today, the average cost of throwing birthday parties for children until the age of 21 is Â£19,425 - more than a luxury car or chartering a private jet. â¢ Why a lavish party is the easiest way to ruin your child's birthday.he poll of 2,000 parents, commissioned by Asda, revealed the true cost of children's parties as almost half of parents (48 per cent) spend up to Â£500 on their child's birthday celebration each year.
Half (49%) of parents buy their children between six and 15 presents at Christmas, spending an average of Â£177 per child per year, an increase of Â£14 (8%) in the last year. More money is spent on 10 and 13 year olds who receive Â£228 worth of gifts from their parents.