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.
108 comments. Turning 13 is a big deal, so a 13th birthday party should be a big deal too. However, making a 13th birthday special does not have to be expensive â it really is the little things that are remembered.3th Birthday Themes. You might find that your almost 13 year old is too old for traditional themed parties, but you can still tie the party together by choosing a specific colour, a type of food, or focusing on the type of entertainment.