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.
Getty Images. The cost of going to prom -- the perfect dress or tuxedo, a limo, and pre-dance festivities -- has risen to a nationwide average of $1,139. That figure represents a 5 percent increase from the $1,078 in 2012 that American families who have a teenager attending a prom spent on all aspects of the dance.hile the Northeastern families surveyed will spend the most, with an average of $1,528, those surveyed going to prom in the Midwest will only spend an average of $722.