english: The lung is thought to have evolved as a structure to allow early fish, many of which lived in warm, stagnant water with little oxygen, to take advantage of the abundant oxygen in the air overhead.
non_english: Smatra se da su pluća evoluirala kao struktura zbog koje su rane ribe, mnoge od kojih su živele u toplim, stajaćim vodama s malo vazduha, iskorišćavale obilje kiseonika u vazduhu iznad njih.