How does active immunity occurs?

What happens when a aneurysm rupture? What happens when circulation is poor in old persons? How many days until it will show that you are pregnant? What causes bureaucratic paralysis? Is brown discharge on your panties part of being pregnant? What organ in the ear is used to trap sound waves and direct them into its outer chamber? What happens when your tooth rots underneath a crown? Does HIV spread by water if there are cuts in mouth? Does prostate brachytherapy lead to a higher risk of bladder or rectal cancers? Can pregnancy cause cervical cancer? How can your skeletal system and muscular system work together to break down large molecules into small compounds your boy can use? Small sacs in the lungs that exchange gases with blood are what? Is it safe for puppies to take vitamins for the immune system? In the last ten years how many cases of HIV infection have been related to occupational exposure? What effect does salt have on albinos? Will an infection affect decrease red blood cell count? How many face transplants have been done? What is the function of the trigeminal nerve? Can you push your tooth into place with your tongue? What is the difference between the structure of the two sides of the heart?