Identify the 5 structures of the lymphatic system indicated…

Identify the 5 structures of the lymphatic system indicated by the letters A[A] (this is not in the cheek or salivary gland  but instead a part of the lymphatic system), B[B], C[C](the general name for the enlarged green bumps) , D[D], and E[E] ( general name for the green bumps in the intestine) in the following diagram:

Why is type O negative blood considered the universal blood…

Why is type O negative blood considered the universal blood donor and type AB positive considered the universal blood recipient.  (you must use the words glycoprotein, agglutinin and agglutinogen where appropriate to receive full credit AND discuss BOTH O and AB blood types getting and receiving blood). (to avoid any possible confusion/wasted effort- (I know it perplexed me) most transfusions are NOT whole blood but instead just the erythrocytes so material in the plasma is less significant- so don’t explain that potential issue to me).