What mechanism of immunity causes red blood cells to clump when exposed to incompatible blood types?

How many people recover every year from obesity? What are the Three regions of the male urethra? What most common dental disease among young people? How is CMV transmitted? What would be the antagonist to the muscle that flexes the arm would be a muscle that? How can you treat a bruise above the knee other than ice? Does paranoia ever go away? Where do you get period pains? How did fruit bats get Ebola? What causes spinocerebellar ataxia? Did Dorothy ever wake up with the Ruby slippers on? How did people relieve stress during the great depression? Why is the apex of the right lung more likely to have tuberculosis? What is positive pressure breathing apparatus? What happened to it when the light was flashed into eye? Why do the gonads sometimes appear large? Is Acne during puberty more severe in males than it is to females? Is Mediastinal Adenopathy treatable? What are the actions of the muscles for the abdominal muscle? How many components does the adult sternum have?