At the extreme opposite end of the size scale, the class of marine bacteria, the Prochlorococci -- that will be on the final exam -- although discovered only in 1988, are now recognized as likely the most abundant organisms on Earth, and moreover, responsible for a large part of the photosynthesis that occurs in the ocean.
Na posve suprotnom kraju skale veličine, klasa morskih bakterija, Prochlorococci -- to će biti  u završnom ispitu -- iako je otkrivena 1988. godine, sada je  prepoznata kao najrašireniji organizam, štoviše, odgovorna je za najveći dio fotosinteze koja se događa u oceanu.