While we know the role of the electrons in water production, the protons are shuttled back into the matrix and allow ATP sythase to make ATP. An analogy for the last step of the electron transport chain is a fan at the bottom of a staircase.
Simpsons Comics #3 - Krusty the Klown (Bongo, 1994) - NM $9.29. Buy It Now. Up for sale is Simpsons Comics #3 from Bongo circa 1994. The estimated grade is NM. This is an opportunity to own this key issue for a reasonable price. The comic will come bagged and boarded.
Several US public schools even banned The Simpsons merchandise and t-shirts, such as one featuring Bart and the caption Underachiever ('And proud of it, man!'). Despite the ban, The Simpsons merchandise sold well and generated US$2 billion in revenue during the first 14 months of sales.